Registration No. 333-103234
                                                Filed pursuant to Rule 424(b)(3)


PROSPECTUS
----------

                                  $639,000,000

                                   3M COMPANY

                     LIQUID YIELD OPTION(TM) NOTES DUE 2032
                             (ZERO COUPON -- SENIOR)
               AND SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION
                      OF THE LIQUID YIELD OPTION(TM) NOTES

                      ------------------------------------

                                  THE OFFERING:

         We issued $639,000,000 aggregate principal amount at maturity of our
Liquid Yield Option Notes due 2032 (Zero Coupon - Senior), or "LYONs", in a
private placement on November 21, 2002 at an issue price of $860.87 per LYON
(86.087% of the principal amount at maturity). This prospectus covers the resale
by holders of the LYONs and shares of our common stock into which the LYONs are
convertible that have not previously been sold in a public offering. As of
August 19, 2003, $167,667,000 principal amount at maturity of LYONs have
previously been sold in public offerings pursuant to the registration statement
of which this prospectus forms a part. We will not pay interest on the LYONs
prior to maturity unless contingent interest becomes payable as described below.
Instead, on November 21, 2032, the maturity date of the LYONs, each holder will
receive $1,000 per LYON. The issue price of each LYON represents a yield to
maturity of 0.5% per year calculated from November 21, 2002, excluding any
contingent interest. The LYONs rank equally with all of our existing and future
unsecured and unsubordinated indebtedness. We will not receive any proceeds from
the resale of the LYONs or the common stock sold under this prospectus.

                          CONVERTIBILITY OF THE LYONS:

         Holders may convert each LYON into 9.4602 shares of our common stock,
subject to adjustment, which we refer to as the conversion rate, only (1) if the
sale price of our common stock reaches specified thresholds, (2) during any
period in which the credit rating assigned to the LYONs is below a specified
level, (3) if the LYONs are called for redemption or (4) if specified corporate
transactions have occurred. Upon conversion, we will have the right to deliver,
in lieu of our common stock, cash or a combination of cash and common stock in
an amount described herein. Our common stock is listed on the New York Stock
Exchange under the symbol "MMM." On September 22, 2003, the last reported sale
price of our common stock on the New York Stock Exchange was $142.12 per share.

                              CONTINGENT INTEREST:

         We will pay contingent cash interest on the LYONs during any six-month
period from November 22 to May 21 and from May 22 to November 21, with the
initial six-month period commencing November 22, 2007, if the average market
price of a LYON for a five day trading measurement period preceding such
six-month period equals 130% or more of the sum of the issue price and accrued
original issue discount for such LYON as of the day immediately preceding the
relevant six-month period. The contingent interest payable per LYON in respect
of any quarterly period will be equal to the greater of (1) any regular cash
dividends paid by us per share on our common stock during that quarterly period
multiplied by the then applicable conversion rate or (2) $0.62 multiplied by
4.7301 (the dividend rate at the initial issuance of the LYONs times the initial
conversion rate). For United States Federal income tax purposes, the LYONs will
constitute contingent payment debt instruments. You should read the discussion
of selected United States Federal income tax considerations relevant to the
LYONs beginning on page 24.

            PURCHASE OF THE LYONS BY 3M AT THE OPTION OF THE HOLDER:

         Holders may require us to purchase all or a portion of their LYONs on
November 21, 2005, 2007, 2012, 2017, 2022 and 2027 at prices set forth in
"Description of LYONs--Purchase of LYONs by 3M at the Option of the Holder." We
may choose to pay the purchase price in cash, our common stock or a combination
of cash and our common stock. In addition, upon a change in control, as defined
in the indenture, of 3M occurring on or before November 21, 2007, holders may
require us to repurchase for cash all or a portion of their LYONs.

                  REDEMPTION OF THE LYONS AT THE OPTION OF 3M:

         We may redeem for cash all or a portion of the LYONs at any time on or
after November 21, 2007 at the prices set forth in "Description of LYONs--
Redemption of LYONs at the Option of 3M."

         Prior to this offering, the LYONs have been eligible for trading in the
Private Offerings, Resales and Trading through Automated Linkages ("PORTAL")
system of the National Association of Securities Dealers, Inc. LYONs sold by
means of this prospectus are not expected to remain eligible for trading on the
PORTAL system. We do not intend to list the LYONs for trading on any national
securities exchange or on the Nasdaq National Market.

                      ------------------------------------

         INVESTING IN THE LYONS INVOLVES RISKS, SOME OF WHICH ARE DESCRIBED IN
THE "RISK FACTORS" SECTION BEGINNING ON PAGE 7 OF THIS PROSPECTUS.

                      ------------------------------------

         Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
adequacy or accuracy of this prospectus. Any representation to the contrary is a
criminal offense.

               The date of this prospectus is September 23, 2003.

(TM)Trademark of Merrill Lynch & Co., Inc.


                                TABLE OF CONTENTS

                                                                            PAGE
                                                                            ----
WHERE YOU CAN FIND MORE INFORMATION.....................................      2
FORWARD LOOKING INFORMATION.............................................      3
SUMMARY.................................................................      4
RECENT DEVELOPMENTS.....................................................      7
RISK FACTORS............................................................      7
USE OF PROCEEDS.........................................................      9
PRICE RANGE OF OUR COMMON STOCK AND DIVIDENDS...........................      9
RATIO OF EARNINGS TO FIXED CHARGES......................................     10
DESCRIPTION OF LYONs....................................................     10
DESCRIPTION OF OUR CAPITAL STOCK........................................     23
CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS.................     24
SELLING SECURITY HOLDERS................................................     28
PLAN OF DISTRIBUTION....................................................     33
LEGAL MATTERS...........................................................     34
EXPERTS.................................................................     34

                       WHERE YOU CAN FIND MORE INFORMATION

         We have filed and will file reports and other information with the SEC
under the Exchange Act. You may read and copy this information at the following
SEC public reference room:

                     Public Reference Room
                     450 Fifth Street, N.W.
                     Room 1024
                     Washington, D.C. 20549

         You may also obtain copies of this information by mail from the Public
Reference Section of the SEC, 450 Fifth Street, N.W., Room 1024, Washington,
D.C. 20549, at prescribed rates. Please call the SEC at 1-800-SEC-0330 for
additional information about the public reference room.

         The SEC also maintains a web site that contains reports, proxy
statements and other information about issuers, including 3M, who file
electronically with the SEC. The address of that site is www.sec.gov.

         We are "incorporating by reference" into this prospectus certain
information filed by us with the SEC, which means that we are disclosing
important information to you by referring you to those documents. The
information incorporated by reference is deemed to be part of this prospectus,
except to the extent modified or superseded, as described below. This prospectus
incorporates by reference the documents set forth below that we have been
previously filed with the SEC. Those documents contain important information
about us and our finances.

         o        Our annual report on Form 10-K for the year ended December 31,
                  2002.

         o        Our quarterly reports on Form 10-Q for the quarter ended March
                  31, 2003 and the quarter ended June 30, 2003.

         o        Our current reports on Form 8-K dated March 4, 2003, March 26,
                  2003, May 23, 2003, August 13, 2003, and August 21, 2003.

         All documents filed by us with the SEC under Sections 13(a), 13(c), 14
and 15(d) of the Exchange Act from the date of this prospectus to the end of the
offering of the LYONs and the common stock under this document, or after the
date of this registration statement to the date of effectiveness of this
registration statement (other than current reports furnished under Item 9 or
Item 12 of Form 8-K) shall also be deemed to be incorporated by reference and
will automatically update information in this prospectus.

         You may request a copy of these filings, at no cost, by writing or
calling us at the following address or telephone number:

                     3M Company
                     3M Center
                     St. Paul, Minnesota 55144 Attention: Investor Relations
                     Tel: 651-733-1110

2


         Exhibits to the filings will not be sent, however, unless those
exhibits have specifically been incorporated by reference in this document.

                           FORWARD LOOKING INFORMATION

         All statements included or incorporated by reference in this document,
other than statements of historical facts, that address activities, events or
developments that we intend, expect, project, believe or anticipate will or may
occur in the future are forward looking statements. Such statements are
typically characterized by terminology such as "believe," "anticipate,"
"should," "intend," "plan," "will," "expect," "estimate," "project,"
"positioned," "strategy," and similar expressions. These statements are based on
assumptions and assessments made by our management in light of its experience
and its perception of historical trends, current conditions, expected future
developments and other factors our management believes to be appropriate. These
forward looking statements are subject to a number of risks and uncertainties,
including those risks described in this prospectus under "Risk Factors," as well
as other factors that our management has not yet identified. Any such forward
looking statements are not guarantees of future performance and actual results,
developments and business decisions may differ from those contemplated by such
forward looking statements. We disclaim any duty to update any forward looking
statements.









3


                                     SUMMARY

         THE FOLLOWING SUMMARY IS QUALIFIED IN ITS ENTIRETY BY THE MORE DETAILED
INFORMATION INCLUDED ELSEWHERE OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS.
BECAUSE THIS IS A SUMMARY, IT MAY NOT CONTAIN ALL THE INFORMATION THAT MAY BE
IMPORTANT TO YOU. YOU SHOULD READ THE ENTIRE PROSPECTUS, AS WELL AS THE
INFORMATION INCORPORATED BY REFERENCE, BEFORE MAKING AN INVESTMENT DECISION.
WHEN USED IN THIS PROSPECTUS, THE TERMS "3M," "3M COMPANY," "WE," "OUR" AND "US"
REFER TO 3M COMPANY AND ITS CONSOLIDATED SUBSIDIARIES, UNLESS OTHERWISE
SPECIFIED.

                                   3M COMPANY

         3M was incorporated in 1929 under the laws of the State of Delaware to
continue operations, begun in 1902, of a Minnesota corporation originally named
Minnesota Mining and Manufacturing Company. On April 8, 2002, the company's name
was changed to 3M Company. 3M's principal executive offices are located at 3M
Center, St. Paul, Minnesota 55144 (telephone: 651-733-1110).

         3M is a diversified global company with a market presence in health
care, safety, electronics, telecommunications, industrial, consumer and office,
and other markets. 3M is an integrated enterprise characterized by substantial
intercompany cooperation in research, manufacturing and marketing of products.
3M's business has developed from its research and technology in coating and
bonding for coated abrasives, the company's original product. Coating and
bonding is the process of applying one material to another, such as abrasive
granules to paper or cloth (coated abrasives), adhesives to a backing
(pressure-sensitive tapes), ceramic coating to granular mineral (roofing
granules), glass beads to plastic backing (reflective sheeting) and low-tack
adhesives to paper (repositionable notes).

         3M is among the leading manufacturers of products for many of the
markets it serves. In all cases, 3M products are subject to direct or indirect
competition. Most 3M products involve expertise in product development,
manufacturing and marketing, and are subject to competition from products
manufactured and sold by other technically oriented companies.

         Our strategic business units have been aggregated into seven reportable
segments: Industrial Business, Health Care Business, Transportation Business,
Display and Graphics Business, Safety, Security and Protection Services
Business, Consumer and Office Business, and Electro and Communications Business.
These segments bring together common or related 3M technologies, enhancing the
development of innovative products and services and providing for efficient
sharing of business resources. These segments have worldwide responsibility for
virtually all 3M product lines. A few miscellaneous businesses and
staff-sponsored products, as well as various corporate assets and corporate
overhead expenses, are not assigned to the segments.



                                                 THE OFFERING
                                              
LYONs........................................    $639,000,000 aggregate principal amount at maturity of LYONs due November 21,
                                                 2032. We will not pay interest on the LYONs prior to maturity unless contingent
                                                 interest becomes payable as described below. Each LYON was issued at a price of
                                                 $860.87 per LYON and has a principal amount at maturity of $1,000.

Maturity of LYONs............................    November 21, 2032.

Yield to Maturity of LYONs...................    0.5% per year (computed on a semi-annual bond equivalent basis) calculated from
                                                 November 21, 2002, excluding any contingent interest.

Ranking......................................    The LYONs are unsecured and unsubordinated obligations of 3M and rank equally in
                                                 right of payment to all our existing and future unsecured and unsubordinated
                                                 indebtedness. However, a significant portion of 3M's business is conducted
                                                 through subsidiaries; and, because claims by creditors of those subsidiaries
                                                 would be senior to 3M's equity interests in such subsidiaries, indebtedness of
                                                 3M, including the LYONs, is structurally subordinated to the claims of such
                                                 creditors. As of June 30, 2003 we had approximately $3,022 million of
                                                 consolidated senior indebtedness outstanding.


4




                                              
Original Issue Discount......................    We offered the LYONs at an issue price significantly below the principal amount
                                                 at maturity of the LYONs. The difference between the issue price and the
                                                 principal amount at maturity of a LYON is referred to as original issue
                                                 discount. This original issue discount accrues daily at a rate of 0.5% per year
                                                 beginning on November 21, 2002, calculated on a semi-annual bond equivalent
                                                 basis, using a 360-day year comprised of twelve 30-day months. The accrual of
                                                 imputed interest income, also referred to as tax original issue discount, as
                                                 calculated for United States Federal income tax purposes, is expected to exceed
                                                 the accrued original issue discount. See "Certain United States Federal Income
                                                 Tax Considerations--Accrual of Interest on the LYONs."

Conversion Rights............................    For each LYON surrendered for conversion, if the conditions for conversion are
                                                 satisfied, a holder will receive 9.4602 shares of our common stock. Upon
                                                 conversion, we will have the right to deliver, in lieu of our common stock, cash
                                                 or a combination of cash and common stock. If we elect to pay holders cash for
                                                 their LYONs, the payment will be based on the average sale price of our common
                                                 stock for the five consecutive trading days immediately following either:

                                                 o    the date of our notice of our election to deliver cash, which we must give
                                                      within two business days after receiving a conversion notice, unless
                                                      we have earlier given notice of redemption as described in this prospectus; or

                                                 o    the conversion date, if we have given notice of redemption specifying that we
                                                      intend to deliver cash upon conversion thereafter.

                                                 The conversion rate will be adjusted for reasons specified in the indenture but
                                                 will not be adjusted for accrued original issue discount. Upon conversion, a holder
                                                 will not receive any cash payment representing accrued original issue discount,
                                                 contingent interest or accrued tax original issue discount. Instead, such amounts
                                                 will be deemed paid by the shares of common stock, cash or a combination of cash
                                                 and common stock received by the holder on conversion. See "Description of LYONs--
                                                 Conversion Rights."

                                                 Holders may surrender LYONs for conversion in any calendar quarter commencing after
                                                 March 31, 2003 if the closing sale price of our common stock for at least 20
                                                 trading days in a period of 30 consecutive trading days ending on the last trading
                                                 day of the preceding calendar quarter is more than 130% of the accreted conversion
                                                 price per share of common stock on the last day of such preceding quarter. The
                                                 accreted conversion price per share as of any day will equal the issue price of a
                                                 LYON plus the accrued original issue discount to that day, divided by the
                                                 conversion rate on that day.

                                                 Holders may also surrender a LYON for conversion at any time when the credit rating
                                                 assigned to the LYONs is Baa1 or lower by Moody's Investors Service ("Moody's") or
                                                 BBB+ or lower by Standard & Poor's Credit Market Services, a division of The
                                                 McGraw-Hill Companies ("Standard & Poor's").

                                                 LYONs or portions of LYONs in integral multiples of $1,000 principal amount at
                                                 maturity called for redemption may also be surrendered for conversion until the
                                                 close of business on the second business day prior to the redemption date. In
                                                 addition, if we make certain distributions to our shareholders or if we are a party
                                                 to certain consolidations, mergers or binding share exchanges, LYONs may be
                                                 surrendered for conversion as provided in "Description of LYONs--Conversion
                                                 Rights." The ability to surrender LYONs for conversion will expire at the close of
                                                 business on November 20, 2032.


5




                                              
Contingent Interest.........................     We will pay contingent interest to the holders of LYONs during any six-month
                                                 period from November 22 to May 21, and from May 22 to November 21, with the
                                                 initial six-month period commencing November 22, 2007, if the average market
                                                 price of a LYON for the Applicable Five Trading Day Period equals 130% or more
                                                 of the sum of the issue price and accrued original issue discount for such LYON
                                                 as of the day immediately preceding the relevant six-month period. "Applicable
                                                 Five Trading Day Period" means the five trading days ending on the second
                                                 trading day immediately preceding the relevant six-month period, unless we
                                                 declare a regular cash dividend for which the record date falls prior to the
                                                 first day of a six-month period but the payment date falls within such six-month
                                                 period, in which case the "Applicable Five Trading Day Period" means the five
                                                 trading days ending on the second trading day immediately preceding such record
                                                 date.

                                                 The amount of contingent interest payable per LYON in respect of any quarterly
                                                 period within a six-month period in which contingent interest is payable will be
                                                 equal to the greater of (1) any regular cash dividends paid by us per share on our
                                                 common stock during that quarterly period multiplied by the then applicable
                                                 conversion rate or (2) $0.62 multiplied by 4.7301 (the dividend rate at the initial
                                                 issuance of the LYONs times the initial conversion rate).

                                                 Contingent interest, if any, will accrue and be payable to holders of LYONs as of
                                                 the record date for the related regular cash dividend or, if we do not pay a
                                                 regular cash dividend on our common stock during a quarter within the relevant six-
                                                 month period, to holders of LYONs as of the 15th day preceding the last day of the
                                                 relevant six-month period. Such payments will be paid on the payment date of the
                                                 related regular cash dividend or, if no regular cash dividend is paid by us during
                                                 a quarter within the relevant six-month period, on the last day of the relevant
                                                 six-month period. The original issue discount will continue to accrue at the yield
                                                 to maturity whether or not contingent interest is paid.

Tax Original Issue Discount..................    The LYONs are debt instruments subject to the United States Federal income tax
                                                 contingent payment debt regulations. You should be aware that, even if we do not
                                                 pay any contingent interest on the LYONs, you will be required to include
                                                 interest in your gross income for United States Federal income tax purposes.
                                                 This imputed interest, also referred to as tax original issue discount, will
                                                 accrue at a rate equal to 4.55% per year, computed on a semi-annual bond
                                                 equivalent basis, which represents the yield we believe we would have paid, as
                                                 of the original issue date of the LYONs, on our noncontingent, nonconvertible,
                                                 fixed-rate debt with terms otherwise similar to the LYONs, subject to a minimum
                                                 yield equal to the applicable Federal rate (based on the overall maturity of the
                                                 LYONs). The rate at which the tax original issue discount will accrue for United
                                                 States Federal income tax purposes (which we believe will equal the minimum
                                                 yield equal to the applicable Federal rate described above) will exceed the
                                                 stated yield of 0.5% for the accrued original issue discount. Your adjusted tax
                                                 basis in a LYON will be increased over time to reflect the accrual of the tax
                                                 original issue discount and will be decreased to reflect certain projected
                                                 payments on a LYON.

                                                 You will also recognize gain or loss on the sale, exchange, conversion or
                                                 redemption of a LYON in an amount equal to the difference between the amount
                                                 realized on the sale, exchange, conversion or redemption, including the fair market
                                                 value of any common stock received upon conversion or otherwise, and your adjusted
                                                 tax basis in the LYON. Any gain recognized by you on the sale, exchange, conversion
                                                 or redemption of a LYON generally will be ordinary interest income; any loss will
                                                 be ordinary loss to the extent of the interest previously included in income, and
                                                 thereafter, capital loss. See "Certain United States Federal Income Tax
                                                 Considerations."

Redemption of LYONs at the Option
   of 3M ....................................    We may redeem all or a portion of the LYONs for cash at any time on or after
                                                 November 21, 2007 at the redemption prices set forth in "Description of
                                                 LYONs--Redemption of LYONs at the Option of 3M."


6




                                              
Purchase of LYONs by 3M at the Option of
   the Holder  .............................     Holders may require us to purchase all or a portion of their LYONs:

                                                 o    on November 21, 2005 at a price equal to $873.86 per LYON;

                                                 o    on November 21, 2007 at a price equal to $882.64 per LYON;

                                                 o    on November 21, 2012 at a price equal to $904.95 per LYON;

                                                 o    on November 21, 2017 at a price equal to $927.83 per LYON;

                                                 o    on November 21, 2022 at a price equal to $951.29 per LYON; and

                                                 o    on November 21, 2027 at a price equal to $975.34 per LYON.

                                                 In each case, such price includes accrued original issue discount to the purchase
                                                 date. We may choose to pay the purchase price in cash or in common stock (based on
                                                 the prevailing market price thereof) or a combination of cash and common stock. See
                                                 "Description of LYONs--Purchase of LYONs by 3M at the Option of the Holder."

Change in Control...........................     Upon a change in control (as defined in the indenture) of 3M occurring on or
                                                 before November 21, 2007, each holder may require us to repurchase all or a
                                                 portion of such holder's LYONs for cash at a price equal to 100% of the issue
                                                 price for such LYONs plus accrued original issue discount to the date of
                                                 repurchase. See "Description of LYONs--Change in Control Permits Purchase of
                                                 LYONs by 3M at the Option of the Holder."

Sinking Fund................................     None.

Trading Symbol of Our Common Stock...........    Our common stock is traded on the New York Stock Exchange under the symbol
                                                 "MMM."


                              RECENT DEVELOPMENTS

         On August 11, 2003, 3M announced that its Board of Directors declared a
two-for-one split on the company's common stock. The stock split will be in the
form of a stock dividend to be distributed September 29, 2003 to shareholders of
record at the close of business on September 22, 2003. All common stock and
related information has been modified in this prospectus to reflect the stock
split.

                                  RISK FACTORS

         An investment in the LYONs involves a number of risks, some of which
could be substantial and are inherent in our businesses. You should consider the
following factors carefully before deciding to purchase LYONs. Additional risks
not presently known to 3M or that 3M currently deems immaterial may also impair
3M's business operations. Actual future results and trends may differ materially
from historical results or those anticipated depending on a variety of factors,
including, but not limited to, those described below.

                         RISKS RELATED TO THIS OFFERING

AN ACTIVE TRADING MARKET FOR THE LYONS MAY NOT DEVELOP.

         The LYONs comprise a new issue of securities for which there is
currently no public market. The LYONs will not be listed on any securities
exchange or included in any automated quotation system. We do not know whether
an active trading market will develop for the LYONs. If the LYONs are traded
after their initial issuance, they may trade at a discount from their initial
offering price depending on prevailing interest rates, the market for similar
securities, the price of our common stock, its and our performance and other
factors.

IN CERTAIN CIRCUMSTANCES, YOUR CLAIMS AS A HOLDER OF A LYON COULD BE
SUBORDINATED IN THE EVENT OF OUR BANKRUPTCY.

         If a holder elects to convert a LYON for common stock of 3M and we
thereafter become the subject of bankruptcy proceedings, if we have failed to
deliver our common stock, a holder's claim in respect of the LYONs could be
subordinated to all of our existing and future obligations. Furthermore, it is
unclear how such a subordinated claim would be valued.

WE MAY NOT HAVE THE FUNDS NECESSARY TO PURCHASE LYONS AT THE OPTION OF THE
HOLDERS OR UPON A CHANGE IN CONTROL.

         On specified dates and upon the occurrence of specific kinds of change
in control events occurring on or before November 21, 2007, holders of LYONs may
require us to purchase all or a portion of their LYONs.

         However, it is possible that upon a change in control we would not have
sufficient funds to make the required purchase of LYONs or that restrictions in
our other indebtedness would not allow those purchases. In addition, certain
important corporate events, such as leveraged recapitalizations that would
increase the level of our indebtedness, would not constitute a "change in

7


control" under the indenture. See "Description of LYONs --Change in Control
Permits Purchase of LYONs by 3M at the Option of the Holder."

YOU SHOULD CONSIDER THE UNITED STATES FEDERAL INCOME TAX CONSEQUENCES OF OWNING
LYONS.

         The LYONs will be characterized as indebtedness of ours for United
States federal income tax purposes. Accordingly, you will be required to include
interest with respect to the LYONs in your gross income.

         The LYONs constitute contingent payment debt instruments. As a result,
you will be required to include amounts in income, as ordinary income, in
advance of the receipt of the cash attributable thereto, and to accrue interest
on a constant yield to maturity basis at a rate comparable to the rate at which
we would have issued a noncontingent, nonconvertible, fixed-rate debt instrument
with terms otherwise similar to the LYONs, subject to a minimum yield equal to
the applicable Federal rate (based on the overall maturity of the LYONs). This
rate (which will equal the required minimum rate equal to the applicable Federal
rate described above) will be 4.55% per year on a semiannual compounding basis.
The amount of interest income required to be included by you for each year will
be in excess of the yield to maturity of the LYONs. You will recognize gain or
loss on the sale, exchange, conversion or redemption of a LYON in an amount
equal to the difference between the amount realized on such sale, exchange,
conversion or redemption, including the fair market value of any common stock
received upon conversion or otherwise, and your adjusted tax basis in the LYON.
Any gain recognized by you on the sale, exchange, conversion or redemption of a
LYON generally will be ordinary interest income; any loss will be ordinary loss
to the extent of the interest previously included in income, and thereafter,
capital loss. A summary of the United States federal income tax consequences of
ownership of the LYONs is described in this prospectus under the heading
"Certain United States Federal Income Tax Considerations."

RISKS RELATED TO OUR BUSINESS

3M'S BUSINESS MAY BE AFFECTED BY THE EFFECTS OF, AND CHANGES IN, WORLDWIDE
ECONOMIC CONDITIONS.

         3M operates in more than 60 countries and derives more than half of its
revenues from sales outside the United States. 3M's business may be affected by
factors in the United States and other countries that are beyond its control,
such as downturns in economic activity in a specific country or region; social,
political or labor conditions in a specific country or region; or potential
adverse foreign tax consequences.

FOREIGN CURRENCY EXCHANGE RATES AND FLUCTUATIONS IN THOSE RATES MAY AFFECT 3M'S
ABILITY TO REALIZE PROJECTED GROWTH RATES IN ITS SALES AND NET EARNINGS AND ITS
RESULTS OF OPERATIONS.

           Because 3M derives more than half of its revenues from sales outside
the United States, 3M's ability to realize projected growth rates in its sales
and net earnings and its results of operations could be adversely affected if
the United States dollar strengthens significantly against foreign currencies.

3M'S GROWTH OBJECTIVES ARE LARGELY DEPENDENT ON THE TIMING AND MARKET ACCEPTANCE
OF ITS NEW PRODUCT OFFERINGS, INCLUDING ITS ABILITY TO RENEW ITS PIPELINE OF NEW
PRODUCTS AND TO BRING THOSE PRODUCTS TO MARKET.

         This ability may be adversely affected by difficulties or delays in
product development, such as the inability to:

         o    identify viable new products;

         o    obtain adequate intellectual property protection;

         o    gain market acceptance of new products; or

         o    Successfully complete clinical trials and obtain regulatory
              approvals. As with any pharmaceutical under development, there
              are substantial risks and uncertainties in the process of
              development and regulatory review. There are no guarantees that
              products will receive regulatory approvals or prove to be
              commercially successful.

3M'S FUTURE RESULTS ARE SUBJECT TO FLUCTUATIONS IN THE COSTS OF PURCHASED
COMPONENTS AND MATERIALS DUE TO MARKET DEMAND, CURRENCY EXCHANGE RISKS,
SHORTAGES AND OTHER FACTORS.

           3M depends on various components and materials for the manufacturing
of its products. Although 3M has not experienced any difficulty in obtaining
components and materials, it is possible that any of its supplier relationships
could be terminated in the future. Any sustained interruption in 3M's receipt of
adequate supplies could have a material adverse effect on it. In addition, while
3M has a process to minimize volatility in component and material pricing, no
assurance can be given that

8


3M will be able to successfully manage price fluctuations due to market demand,
currency risks, or shortages or that future price fluctuations will not have a
material adverse effect on it.

THE POSSIBILITY THAT 3M'S ACQUISITIONS, DIVESTITURES AND STRATEGIC ALLIANCES MAY
NOT MEET SALES AND/OR PROFIT EXPECTATIONS

         As part of 3M's strategy for growth, it has made and may continue to
make acquisitions, divestitures and strategic alliances. However, there can be
no assurance that any of these will be completed or beneficial to 3M.

3M IS THE SUBJECT OF VARIOUS LEGAL PROCEEDINGS.

         The current estimates of the potential impact on 3M's consolidated
financial position, results of operations and cash flows for its legal
proceedings and claims are predictions made by 3M about the future and should be
considered forward-looking statements. These estimates could change in the
future.

         For a more detailed discussion of legal proceedings involving 3M, see
the discussion of "Legal Proceedings" in Part II, Item 1 of 3M's Quarterly
Report on Form 10-Q for the period ended June 30, 2003, which is incorporated
by reference into this prospectus.

                                 USE OF PROCEEDS

         We will not receive any proceeds from the sale of the LYONs or the
shares of common stock offered by this prospectus. See "Selling Security
Holders."

                  PRICE RANGE OF OUR COMMON STOCK AND DIVIDENDS

         Our common stock is listed and traded on the New York Stock Exchange
under the symbol "MMM." The following table sets forth the range of high and low
sales prices per share of our common stock, as reported on the New York Stock
Exchange, and dividends paid on our common stock for the fiscal quarters
presented below. The sale prices per share of our common stock in the table
below have been adjusted to give effect, retroactively, to the two-for-one stock
split to be paid in the form of a stock dividend on September 29, 2003 to
shareholders of record as of the close of buisness on September 22, 2003.

                                                           3M COMMON STOCK
                                                           ---------------
                                                                       DIVIDENDS
                                                     HIGH       LOW      PAID
                                                     ----       ---      ----
2000
      1st Quarter................................  $ 51.91    $ 39.10   $ 0.29
      2nd Quarter................................  $ 49.16    $ 40.22   $ 0.29
      3rd Quarter................................  $ 48.72    $ 40.25   $ 0.29
      4th Quarter................................  $ 61.47    $ 41.97   $ 0.29

2001
      1st Quarter................................  $ 60.75    $ 49.25   $ 0.30
      2nd Quarter................................  $ 63.50    $ 48.58   $ 0.30
      3rd Quarter................................  $ 58.75    $ 42.93   $ 0.30
      4th Quarter................................  $ 60.95    $ 47.60   $ 0.30

2002
      1st Quarter................................  $ 61.85    $ 50.00   $ 0.31
      2nd Quarter................................  $ 65.30    $ 56.15   $ 0.31
      3rd Quarter................................  $ 65.05    $ 54.10   $ 0.31
      4th Quarter................................  $ 65.78    $ 55.38   $ 0.31

2003
      1st Quarter................................  $ 67.48   $ 59.73    $ 0.33
      2nd Quarter................................  $ 68.38   $ 60.26    $ 0.33
      3rd Quarter (through September 22, 2003)...  $ 72.85   $ 63.40    $ 0.33

         The payment of dividends by us is subject to the discretion of our
board of directors and will depend on our and our subsidiaries' financial
position, capital requirements and liquidity, contractual and legal
requirements, results of operations and other factors.

9


                       RATIO OF EARNINGS TO FIXED CHARGES

         The following table sets forth the ratio of earnings to fixed charges
for the periods indicated:

                  YEAR ENDED DECEMBER 31,                        6 MONTHS ENDED
                                                                     JUNE 30,
  1998        1999          2000         2001         2002            2003
  ----        ----          ----         ----         ----            ----
10.3x(1)    15.8x(2)      15.8x(3)     11.5x(4)     20.2x(4)        22.3x(5)

---------------------------

(1) The ratio for the year ended December 31, 1998 includes pre-tax
    restructuring charges of $493 million.
(2) The ratio for the year ended December 31, 1999 includes a net pre-tax gain
    of $100 million relating to special items that include gains on
    divestitures, litigation expense, an investment valuation adjustment, and a
    change in estimate that reduced the 1998 restructuring charges.
(3) The ratio for the year ended December 31, 2000 includes net pre-tax losses
    of $23 million relating to special items.
(4) The ratio for the year 2002, and year 2001, includes net pre-tax losses of
    $202 million and $504 million related to special items, respectively,
    primarily related to the 2001 restructuring plan.
(5) The ratio for the six months ended June 30, 2003 includes $93 million
    pre-tax loss related to the adverse ruling associated with a lawsuit filed
    by LePage's Inc.

o   For purposes of calculating the ratio, fixed charges consist of:

    o gross interest, including the interest component of ESOP benefit expense;

    o amortization of debt expense and discount or premium relating to any
      indebtedness; and

    o the portion of rental expense on operating leases considered to be
       representative of the interest factor therein.

    o The ratio of earnings to fixed charges is calculated as follows:



                                               
    (income from continuing operations            +       (fixed        +         (amortization of         -     (capitalized
before income taxes and minority interest)               charges)               capitalized interest              interest)
-----------------------------------------------------------------------------------------------------------------------------
                                                        (fixed charges)


                              DESCRIPTION OF LYONS

         We issued the LYONs under an indenture between 3M Company and Citibank,
N.A., as trustee, dated as of November 21, 2002. The following summarizes some,
but not all, of the provisions of the LYONs and the indenture. The following
summary does not purport to be complete and is subject to, and qualified by
reference to, all of the provisions of the indenture, which we urge you to read
because they define your rights as a LYONs holder. As used in this description,
the words "we," "us," "3M," "3M Company," or "our" do not include any current or
future subsidiary of 3M.

GENERAL

         The LYONs are limited to $639,000,000 aggregate principal amount at
maturity. The LYONs will mature on November 21, 2032. The principal amount at
maturity of each LYON is $1,000. The LYONs are payable at the office of the
paying agent, which initially will be an office or agency of the trustee, or an
office or agency maintained by us for such purpose, in the Borough of Manhattan,
The City of New York.

         The LYONs were offered at an issue price of $860.87 per LYON, which
represents a substantial discount from their principal amount at maturity.
Except as described below under "--Contingent Interest", we will not make
periodic payments of interest on the LYONs. However, the LYONs will accrue
original issue discount while they remain outstanding. Original issue discount
is the difference between the issue price and the principal amount at maturity
of a LYON. Original issue discount will be calculated on a semi-annual bond
equivalent basis at the yield to maturity of the LYONs, using a 360-day year
comprised of twelve 30-day months. The issue date for the LYONs and the
commencement date for the accrual of original issue discount were November 21,
2002.

         The LYONs are debt instruments subject to the contingent payment debt
regulations. The LYONs were issued with original issue discount for United
States Federal income tax purposes. Even if we do not pay any cash interest
(including any contingent interest) on the LYONs, holders will be required to
include accrued tax original issue discount in their gross income for United
States Federal income tax purposes. The rate at which the tax original issue
discount will accrue will exceed the stated

10


yield of 0.5% for the accrued original issue discount described above. See
"Certain United States Federal Income Tax Considerations."

         Maturity, conversion, purchase by us at the option of a holder or
redemption of a LYON at our option will cause original issue discount and
contingent interest, if any, to cease to accrue on such LYON. We may not reissue
a LYON that has matured or been converted, purchased by us at your option,
redeemed or otherwise cancelled, except for registration of transfer, exchange
or replacement of such LYON.

         LYONs may be presented for conversion at the office of the conversion
agent, and for exchange or registration of transfer at the office of the
registrar, each such agent initially being the trustee. We will not charge a
service fee for any registration of transfer or exchange of LYONs.

RANKING OF LYONS

         The LYONs are unsecured and unsubordinated obligations of ours. The
LYONs rank equal in right of payment to all of our existing and future unsecured
and unsubordinated indebtedness. However, a significant portion of 3M's business
is conducted through subsidiaries; and, because claims by creditors of those
subsidiaries would be senior to 3M's equity interests in such subsidiaries,
indebtedness of 3M, including LYONs, is structurally subordinated to the claims
of such creditors.

         In addition, if a holder surrenders LYONs for conversion and we fail to
deliver such common stock, and we then become the subject of bankruptcy
proceedings, a holder's claim in respect of the LYONs could be subordinated to
all of our existing and future obligations. Furthermore, it is unclear how such
a subordinated claim would be valued.

         As of June 30, 2003, we had approximately $3,022 million of
consolidated senior indebtedness outstanding.

CONVERSION RIGHTS

         Holders may surrender LYONs for conversion into shares of our common
stock only if at least one of the conditions described below is satisfied. In
addition, a LYON for which a holder has delivered a purchase notice or a change
in control purchase notice requiring us to purchase the LYONs may be surrendered
for conversion only if such notice is withdrawn in accordance with the
indenture.

         The conversion rate is 9.4602 shares of common stock per LYON, subject
to adjustment upon the occurrence of certain events described below. A holder of
a LYON otherwise entitled to a fractional share will receive cash equal to the
applicable portion of the then current sale price of our common stock on the
trading day immediately preceding the conversion date. Upon a conversion, we
will have the right to deliver cash or a combination of cash and common stock,
as described below.

         The ability to surrender LYONs for conversion will expire at the close
of business on November 20, 2032.

         The conversion agent will, on our behalf, determine if the LYONs are
convertible and notify the trustee and us accordingly. If one or more of the
conditions to the conversion of the LYONs has been satisfied, we will promptly
notify the holders of the LYONs thereof and use our reasonable best efforts to
post this information on our website or otherwise publicly disclose this
information.

         CONVERSION BASED ON COMMON STOCK PRICE. Holders may surrender LYONs for
conversion in any calendar quarter commencing after March 31, 2003, if the sale
price (as defined below) of our common stock for at least 20 trading days in a
period of 30 consecutive trading days ending on the last trading day of the
preceding calendar quarter is more than 130% of the accreted conversion price
per share of common stock on the last day of such preceding calendar quarter.
The accreted conversion price per share as of any day will equal the issue price
of a LYON plus the accrued original issue discount to that day, divided by the
number of shares of common stock issuable upon conversion of a LYON on that day.

         The table below shows the conversion trigger price per share of our
common stock in respect of each of the first 20 calendar quarters following
March 31, 2003. These conversion trigger prices reflect the accreted conversion
price per share of common stock multiplied by 130%. Thereafter, the accreted
conversion price per share of common stock increases each calendar quarter by
the accreted original issue discount for the calendar quarter, and the
applicable percentage remains at 130%. The conversion trigger price for the
calendar quarter beginning October 1, 2032 is $137.33.

11


                                          (1)                         (3)
                                        ACCRETED        (2)       CONVERSION
                                       CONVERSION   APPLICABLE   TRIGGER PRICE
QUARTER*                                 PRICE      PERCENTAGE     (1) X (2)
--------                                 -----      ----------     ---------
2003
      Second Quarter...............     $ 91.17         130%       $ 118.51
      Third Quarter................       91.28         130%         118.66
      Fourth Quarter...............       91.39         130%         118.81

2004
      First Quarter................       91.51         130%         118.96
      Second Quarter...............       91.62         130%         119.11
      Third Quarter................       91.74         130%         119.26
      Fourth Quarter...............       91.85         130%         119.41

2005
      First Quarter................       91.97         130%         119.56
      Second Quarter...............       92.08         130%         119.70
      Third Quarter................       92.20         130%         119.85
      Fourth Quarter...............       92.31         130%         120.00

2006
      First Quarter................       92.43         130%         120.15
      Second Quarter...............       92.54         130%         120.30
      Third Quarter................       92.66         130%         120.45
      Fourth Quarter...............       92.77         130%         120.60

2007
      First Quarter................       92.89         130%         120.76
      Second Quarter...............       93.01         130%         120.91
      Third Quarter................       93.12         130%         121.06
      Fourth Quarter...............       93.24         130%         121.21

2008
      First Quarter................       93.35         130%         121.36

---------------------------
* This table assumes no events have occurred that would require an adjustment to
  the conversion rate.

         CONVERSION BASED ON CREDIT RATING DOWNGRADE. Holders may also surrender
a LYON for conversion during any period that the rating assigned to the LYONs by
Moody's is Baa1 or lower or Standard & Poor's is BBB+ or lower.

         CONVERSION BASED UPON NOTICE OF REDEMPTION. A holder may surrender for
conversion a LYON called for redemption at any time prior to the close of
business on the second business day immediately preceding the redemption date,
even if it is not otherwise convertible at such time. A LYON for which a holder
has delivered a purchase notice or a change in control purchase notice, as
described below, requiring us to purchase such LYON, may be surrendered for
conversion only if such notice is withdrawn in accordance with the indenture.

         A "business day" is any weekday that is not a day on which banking
institutions in The City of New York are authorized or obligated to close. A
"trading day" is any day on which the NYSE is open for trading or, if the
applicable security is quoted on the Nasdaq National Market, a day on which
trades may be made on such market or, if the applicable security is not so
listed, admitted for trading or quoted, any business day.

         CONVERSION BASED UPON OCCURRENCE OF CERTAIN CORPORATE TRANSACTIONS. If
we are party to a consolidation, merger or binding share exchange or a transfer
of all or substantially all of our assets, a LYON may be surrendered for
conversion at any time from and after the date which is 15 days prior to the
anticipated effective date of the transaction until 15 days after the actual
effective date of such transaction, and at the effective date, the right to
convert a LYON into common stock will be changed into a right to convert it into
the kind and amount of securities, cash or other assets of 3M or another person
which the holder would have received if the holder had converted the holder's
LYONs immediately prior to the transaction. If such transaction also constitutes
a change in control of 3M, as defined in the indenture, the holder will be able
to require us to purchase all or a portion of such holder's LYONs as described
under "--Change in Control Permits Purchase of LYONs by 3M at the Option of the
Holder."

         CONVERSION ADJUSTMENTS AND DELIVERY OF COMMON STOCK. On conversion of a
LYON, a holder will not receive any cash payment representing accrued original
issue discount, and accrued tax original issue discount or, except as described
below, contingent cash interest. Delivery to the holder of the full number of
shares of common stock into which the LYON is convertible together with any cash
payment of such holder's fractional shares, or cash, or a combination of cash
and common stock will be deemed:

12


         o    to satisfy our obligation to pay the principal amount at maturity
              of the LYON; and

         o    to satisfy our obligation to pay accrued original issue discount
              and accrued tax original issue discount, attributable to the
              period from the issue date through the conversion date and,
              except as described below, any accrued and unpaid contingent
              interest.

           As a result, accrued original issue discount and accrued tax original
issue discount are deemed paid in full rather than cancelled, extinguished or
forfeited.

         We and each holder of a LYON also agree that delivery to the holder of
the full number of shares of common stock into which the LYON is convertible
together with any cash payment of such holder's fractional shares, or cash, or a
combination of cash and common stock will be treated as a payment (in an amount
equal to the sum of the then fair market value of such shares and/or such cash
payment, if any) on the LYON for purposes of the Treasury regulations applicable
to debt instruments with contingent payments. See "Certain United States Federal
Income Tax Considerations."

         In lieu of delivery of shares of our common stock upon notice of
conversion of any LYONs (for all or any portion of the LYONs), we may elect to
pay holders surrendering LYONs an amount in cash per LYON (or a portion of a
LYON) equal to the average sale price of our common stock for the five
consecutive trading days immediately following either (1) the date of our notice
of our election to deliver cash as described below if we have not given notice
of redemption, or (2) the conversion date, in the case of conversion following
our notice of redemption specifying that we intend to deliver cash upon
conversion, in either case multiplied by the conversion rate in effect on that
date. We will inform the holders through the trustee no later than two business
days following the conversion date of our election to deliver shares of our
common stock or to pay cash in lieu of delivery of the shares, unless we have
already informed holders of our election in connection with our optional
redemption of the LYONs as described under "--Redemption of LYONs at the Option
of 3M." If we elect to deliver all of such payment in shares of our common
stock, the shares will be delivered through the conversion agent no later than
the fifth business day following the conversion date. If we elect to pay all or
a portion of such payment in cash, the payment, including any delivery of our
common stock, will be made to holders surrendering LYONs no later than the tenth
business day following the applicable conversion date. If an event of default,
as described under "--Events of Default" below (other than a default in a cash
payment upon conversion of the LYONs), has occurred and is continuing, we may
not pay cash upon conversion of any LYONs or portion of a LYON (other than cash
for fractional shares).

         If contingent cash interest is payable to holders of LYONs during any
particular six-month period, and such LYONs are converted after the applicable
record date therefor and prior to the next succeeding interest payment date,
holders of such LYONs at the close of business on the record date will receive
the contingent cash interest payable on such LYONs on the corresponding interest
payment date notwithstanding the conversion. Such LYONs, upon surrender for
conversion, must be accompanied by funds equal to the amount of contingent cash
interest payable on the LYONs so converted, unless such LYONs have been called
for redemption, in which case no such payment shall be required.

         The conversion rate will not be adjusted for accrued original issue
discount, if any, or any contingent cash interest. A certificate for the number
of full shares of common stock into which any LYON is converted or cash
delivered in lieu thereof, together with any cash payment for fractional shares,
will be delivered through the conversion agent as soon as practicable following
the conversion date. For a discussion of the tax treatment of a holder receiving
shares of our common stock upon surrendering LYONs for conversion, see "Certain
United States Federal Income Tax Considerations--Sale, Exchange, Conversion or
Redemption."

         We will adjust the conversion rate for:

         o    dividends or distributions on our common stock payable in our
              common stock or our other capital stock;

         o    subdivisions, combinations or certain reclassifications of our
              common stock;

         o    distributions to all holders of our common stock of certain
              rights to purchase our common stock for a period expiring within
              60 days at less than the then current sale price; and

         o    distributions to the holders of our common stock of our assets
              (including shares of capital stock of a subsidiary) or debt
              securities or certain rights to purchase our securities
              (excluding cash dividends or other cash distributions from
              current or retained earnings, unless the amount thereof, together
              with all other cash dividends paid in the preceding 12 month
              period, per share exceeds the sum of (i) 5% of the sale price of
              our common stock on the day preceding the date of declaration of
              such dividend or other distribution and (ii) the quotient of the
              amount of any

13


              contingent interest paid during such period divided by the number
              of shares of common stock issuable upon conversion of a LYON at
              the conversion rate in effect on the contingent interest payment
              date).

In the event that we pay a dividend or make a distribution on shares of our
common stock consisting of capital stock of, or similar equity interests in, a
subsidiary or other business unit of ours, the conversion rate will be adjusted
based on the market value of the securities so distributed relative to the
market value of our common stock, in each case based on the average closing
prices of those securities for the 10 trading days commencing on and including
the fifth trading day after the date on which "ex-dividend trading" commences
for such dividend or distribution on the NYSE or such other national or regional
securities exchange or market on which the securities are then listed or quoted.

         In the event we elect to make a distribution described in the third or
fourth bullet of the preceding paragraph which, in the case of the fourth
bullet, has a per share value equal to more than 15% of the sale price of our
shares of common stock on the day preceding the declaration date for such
distribution, we will be required to give notice to the holders of LYONs at
least 20 days prior to the ex-dividend date for such distribution and, upon the
giving of such notice, the LYONs may be surrendered for conversion at any time
until the close of business on the business day prior to the ex-dividend date or
until we announce that such distribution will not take place.

         No adjustment to the conversion rate need be made if holders of the
LYONs may participate in the transaction or in certain other cases.

         If we were to implement a stockholders' rights plan providing that,
upon conversion of the LYONs, the holders of such LYONs will receive, in
addition to the shares of common stock issuable upon such conversion, the rights
related to such common stock, there shall not be any adjustment to the
conversion privilege or conversion rate as a result of:

         o    the issuance of the rights;

         o    the distribution of separate certificates representing the
              rights;

         o    the exercise or redemption of such rights in accordance with any
              rights agreement; or

         o    the termination or invalidation of the rights.

         The indenture permits us to increase the conversion rate from time to
time. We are not required to adjust the conversion rate until adjustments
greater than 1% have occurred.

         Holders of the LYONs may, in certain circumstances, be deemed to have
received a distribution subject to federal income tax as a dividend upon:

         o    a taxable distribution to holders of common stock which results
              in an adjustment of the conversion rate;

         o    an increase in the conversion rate at our discretion; or

         o    failure to adjust the conversion rate in some instances.

         See "Certain United States Federal Income Tax Considerations--
Constructive Dividends."

CONTINGENT INTEREST

         Subject to the accrual and record date provisions described below, we
will pay contingent cash interest to the holders of LYONs during any six-month
period from November 22 to May 21 and from May 22 to November 21, with the
initial six-month period commencing November 22, 2007, if the average market
price of a LYON for the Applicable Five Trading Day Period equals 130% or more
of the sum of the issue price and accrued original issue discount for such LYON
as of the day immediately preceding the relevant six-month period. "Applicable
Five Trading Day Period" means the five trading days ending on the second
trading day immediately preceding the first day of the relevant six-month
period, unless we declare a regular cash dividend for which the record date
falls prior to the first day of a six-month period but the payment date falls
within such six-month period, in which case the "Applicable Five Trading Day
Period" means the five trading days ending on the second trading day immediately
preceding such record date.

         The amount of contingent interest payable per LYON in respect of any
quarterly period within a six-month period in which contingent interest is
payable will equal the greater of (1) any regular cash dividends paid by us per
share on our common stock during that quarterly period multiplied by the then
applicable conversion rate or (2) $0.62 multiplied by 4.7301 (the dividend rate
at the initial issuance of the LYONs times the initial conversion rate).

14

         Contingent interest, if any, will accrue and be payable to holders of
LYONs as of the record date for the related common stock dividend or, if we do
not pay a regular cash dividend on our common stock during the relevant six-
month period, to holders of LYONs as of the 15th day preceding the last day of
the relevant six-month period. We will make contingent interest payments on the
payment date of the related common stock dividend or, if we do not pay a regular
cash dividend on our common stock during the relevant six-month period, on the
last day of the relevant six-month period. The original issue discount will
continue to accrue at the yield to maturity whether or not contingent interest
is paid.

         Regular cash dividends are quarterly or other periodic cash dividends
on our common stock as declared by our Board of Directors as part of its cash
dividend payment practices and that are not designated by them as extraordinary
or special or other nonrecurring dividends.

         The market price of a LYON on any date of determination means the
average of the secondary market bid quotations per LYON obtained by the bid
solicitation agent for $10 million principal amount at maturity of LYONs at
approximately 4:00 p.m., New York City time, on such determination date from
three independent nationally recognized securities dealers we select, provided
that if:

         o    at least three such bids are not obtained by the bid solicitation
              agent; or

         o    in our reasonable judgment, the bid quotations are not indicative
              of the secondary market value of the LYONs, then the market price
              of the LYON will equal (1) the then applicable conversion rate of
              the LYONs multiplied by (2) the average sale price of our common
              stock on the five trading days ending on such determination date,
              appropriately adjusted.

         The bid solicitation agent is Citibank, N.A. We may change the bid
solicitation agent, but the bid solicitation agent will not be our affiliate.
The bid solicitation agent will solicit bids from securities dealers that are
believed by us to be willing to bid for the LYONs.

         Upon determination that LYON holders will be entitled to receive
contingent interest during a relevant six-month period, on or prior to the start
of such six-month period, we will issue a press release and publish such
information on our website as soon as practicable.

PURCHASE OF LYONS BY 3M AT THE OPTION OF THE HOLDER

         On the purchase dates of November 21, 2005, November 21, 2007, November
21, 2012, November 21, 2017, November 21, 2022, and November 21, 2027, holders
may require us to purchase any outstanding LYON for which the holder has
properly delivered and not withdrawn a written purchase notice, subject to
certain additional conditions. We may, in our sole discretion, provide the
holders with additional rights to require us to purchase the LYONs on additional
purchase dates. We will notify the holders if we elect to provide any such
additional rights. Holders may submit their LYONs for purchase to the paying
agent at any time from the opening of business on the date that is 20 business
days prior to the purchase date until the close of business on the business day
immediately preceding the purchase date.

         The purchase price of a LYON will be:

          o    $873.86 per LYON on November 21, 2005;

          o    $882.64 per LYON on November 21, 2007;

          o    $904.95 per LYON on November 21, 2012;

          o    $927.83 per LYON on November 21, 2017;

          o    $951.29 per LYON on November 21, 2022; and

          o    $975.34 per LYON on November 21, 2027.

         The purchase prices shown above are equal to the issue price plus
accrued original discount to the purchase date. We may, at our option, elect to
pay the purchase price in cash, shares of common stock, or any combination
thereof. For a discussion of the tax treatment of a holder receiving cash,
shares of common stock or any combination thereof, see "Certain United States
Federal Income Tax Considerations--Sale, Exchange, Conversion or Redemption."

15


         We will be required to give notice on a date not less than 20 business
days prior to each purchase date to all holders at their addresses shown in the
register of the registrar, and to beneficial owners as required by applicable
law, stating among other things:

         o    whether we will pay the purchase price of LYONs in cash or common
              stock or any combination thereof, specifying the percentages of
              each;

         o    if we elect to pay in common stock, the method of calculating the
              market price of the common stock; and

         o    the procedures that holders must follow to require us to purchase
              their LYONs.

           The purchase notice given by each holder electing to require us to
purchase LYONs shall be given to the paying agent no later than the close of
business on the business day immediately preceding the purchase date and must
state:

         o    the certificate numbers of the holder's LYONs to be delivered for
              purchase;

         o    the portion of the principal amount at maturity of LYONs to be
              purchased, which must be $1,000 or an integral multiple of
              $1,000;

         o    that the LYONs are to be purchased by us pursuant to the
              applicable provisions of the LYONs; and

         o    in the event we elect, pursuant to the notice that we are
              required to give, to pay the purchase price in common stock, in
              whole or in part, but the purchase price is ultimately to be paid
              to the holder entirely in cash because any of the conditions to
              payment of the purchase price or portion of the purchase price in
              common stock is not satisfied prior to the close of business on
              the purchase date, as described below, whether the holder elects:

              (1)  to withdraw the purchase notice as to some or all of the
                   LYONs to which it relates, or

              (2)  to receive cash in such event in respect of the entire
                   purchase price for all LYONs or portions of LYONs subject to
                   such purchase notice.

         If the holder fails to indicate the holder's choice with respect to the
election described in the final bullet point above, the holder shall be deemed
to have elected to receive cash in respect of the entire purchase price for all
LYONs subject to the purchase notice in these circumstances.

         A holder may withdraw any purchase notice by delivering a written
notice of withdrawal to the paying agent prior to the close of business on the
purchase date.

         The notice of withdrawal shall state:

         o    the principal amount at maturity of the LYONs being withdrawn;

         o    the certificate numbers of the LYONs being withdrawn; and

         o    the principal amount at maturity, if any, of the LYONs that
              remain subject to the purchase notice.

         If we elect to pay the purchase price, in whole or in part, in shares
of our common stock, the number of shares of our common stock to be delivered by
us shall be equal to the portion of the purchase price to be paid in common
stock divided by the market price of one share of common stock. We will pay cash
based on the market price for all fractional shares of our common stock in the
event we elect to deliver our common stock in payment, in whole or in part, of
the purchase price.

         We will pay cash based on the market price for all fractional shares of
common stock in the event we elect to deliver common stock in payment, in whole
or in part, of the purchase price. See "Certain United States Federal Income Tax
Considerations--Sale, Exchange, Conversion or Redemption."

         The "market price" means the average of the sale prices of our common
stock for the five trading day period ending on the third business day prior to
the applicable purchase date. If the third business day prior to the applicable
purchase date is not a trading day, the five trading day period shall end on the
last trading day prior to such third business day. We will appropriately adjust
the market price to take into account the occurrence, during the period
commencing on the first of such trading days during such five trading day period
and ending on such purchase date, of certain events that would result in an
adjustment of the conversion rate with respect to the common stock.

16


         The "sale price" of our common stock on any date means the closing per
share sale price (or if no closing sale price is reported, the average of the
bid and ask prices or, if more than one in either case, the average of the
average bid and the average ask prices) on such date on the New York Stock
Exchange or such other principal United States securities exchange on which the
common stock is traded or, if the common stock is not listed on a United States
national or regional securities exchange, as reported by the National
Association of Securities Dealers Automated Quotation System or by the National
Quotation Bureau Incorporated. In the absence of a quotation, we will determine
the sale price on the basis of such quotations as we consider appropriate.

         Because the market price of our common stock is determined prior to the
applicable purchase date, holders of LYONs bear the market risk with respect to
the value of the common stock to be received from the date such market price is
determined to such purchase date. We may pay the purchase price or any portion
of the purchase price in common stock only if the information necessary to
calculate the market price is published in a daily newspaper of national
circulation or by other appropriate means.

         Upon determination of the actual number of shares of common stock to be
issued for each $1,000 principal amount at maturity of LYONs in accordance with
the foregoing provisions, we promptly will issue a press release and publish
such information on our website.

         In addition to the above conditions, our right to purchase LYONs, in
whole or in part, with common stock is subject to our satisfying various
conditions, including:

         o    listing such common stock on the principal United States
              securities exchange on which our common stock is then listed;

         o    the registration of the common stock under the Securities Act and
              the Exchange Act, if required; and

         o    any necessary qualification or registration under applicable
              state securities law or the availability of an exemption from
              such qualification and registration.

         If such conditions are not satisfied with respect to a holder prior to
the close of business on the purchase date, we will pay the purchase price of
the LYONs of the holder entirely in cash. We may not change the form or
components or percentages of components of consideration to be paid for the
LYONs once we have given the notice that we are required to give to holders of
the LYONs, except as described in the first sentence of this paragraph.

         In connection with any purchase offer, we will to the extent
applicable:

         o    comply with the provisions of Rule 13e-4, Rule 14e-1 and any
              other tender offer rules under the Exchange Act which may then be
              applicable;

         o    file Schedule TO or any other required schedule under the
              Exchange Act; and

         o    otherwise comply with all federal and state securities laws as
              necessary under the indenture to effect a purchase of LYONs by us
              at the option of a holder.

         Our obligation to pay the purchase price of a LYON for which a purchase
notice has been delivered and not validly withdrawn is conditioned upon the
holder delivering the LYON, together with necessary endorsements, to the paying
agent at any time after delivery of the purchase notice. We will cause the
purchase price plus accrued and unpaid contingent interest, if any, of the LYON
to be paid promptly following the later of the purchase date or the time of
delivery of the LYON.

         If the paying agent holds money or securities sufficient to pay the
purchase price of the LYON on the business day following the purchase date in
accordance with the terms of the indenture, then, immediately after the purchase
date, the LYON will cease to be outstanding and original issue discount on such
LYON will cease to accrue, whether or not the LYON is delivered to the paying
agent. Thereafter, all other rights of the holder shall terminate, other than
the right to receive the purchase price upon delivery of the LYON.

         Our ability to purchase LYONs with cash may be limited by the terms of
our then existing borrowing agreements, as well as the amount of funds available
to us to fund any such purchases.

         We may not purchase any LYONs for cash at the option of holders if an
event of default with respect to the LYONs has occurred and is continuing, other
than a default in the payment of the purchase price with respect to such LYONs.

17


REDEMPTION OF LYONS AT THE OPTION OF 3M

         No sinking fund is provided for the LYONs. Prior to November 21, 2007,
we will not have the option to redeem the LYONs. Beginning on November 21, 2007,
we may redeem the LYONs for cash as a whole at any time, or in part from time to
time. We will give not less than 30 days nor more than 60 days notice of
redemption by mail to holders of LYONs. LYONs or portions of LYONs called for
redemption will be convertible by the holder until the close of business on the
second business day prior to the redemption date.

         The table below shows the redemption prices of a LYON on November 21,
2007, at each November 21 thereafter prior to maturity and at stated maturity on
November 21, 2032. These prices reflect the issue price plus accrued original
issue discount to the redemption date. The redemption price of a LYON redeemed
between such dates would include an additional amount reflecting the additional
original issue discount accrued since the next preceding date in the table and
until, but not including, the redemption date.

                                                            (2)
                                                          ACCRUED        (3)
REDEMPTION DATE                               (1)         ORIGINAL    REDEMPTION
                                             LYON          ISSUE         PRICE
November 21:                              ISSUE PRICE     DISCOUNT     (1)+(2)
------------                              -----------     --------     -------
2007.....................................  $ 860.87       $ 21.77     $  882.64
2008.....................................    860.87         26.18        887.05
2009.....................................    860.87         30.62        891.49
2010.....................................    860.87         35.09        895.96
2011.....................................    860.87         39.57        900.44
2012.....................................    860.87         44.08        904.95
2013.....................................    860.87         48.61        909.48
2014.....................................    860.87         53.16        914.03
2015.....................................    860.87         57.74        918.61
2016.....................................    860.87         62.34        923.21
2017.....................................    860.87         66.96        927.83
2018.....................................    860.87         71.61        932.48
2019.....................................    860.87         76.27        937.14
2020.....................................    860.87         80.97        941.84
2021.....................................    860.87         85.68        946.55
2022.....................................    860.87         90.42        951.29
2023.....................................    860.87         95.18        956.05
2024.....................................    860.87         99.97        960.84
2025.....................................    860.87        104.78        965.65
2026.....................................    860.87        109.61        970.48
2027.....................................    860.87        114.47        975.34
2028.....................................    860.87        119.35        980.22
2029                                         860.87        124.26        985.13
2030.....................................    860.87        129.19        990.06
2031.....................................    860.87        134.15        995.02
At Stated Maturity.......................    860.87        139.13      1,000.00

         If a redemption date occurs during a period when contingent interest is
payable with respect to the LYONs, accrued and unpaid contingent interest to but
excluding the date of redemption will be paid in addition to the redemption
price.

         If we redeem less than all of the outstanding LYONs, the trustee will
select the LYONs to be redeemed on a pro rata basis in principal amounts at
maturity of $1,000 or integral multiples of $1,000 by lot, pro rata, based on
the ownership thereof, or by any other method the trustee considers fair and
appropriate. If a portion of a holder's LYONs is selected for partial redemption
and the holder converts a portion of the LYONs, the converted portion will be
deemed to be the portion selected for redemption.

CHANGE IN CONTROL PERMITS PURCHASE OF LYONS BY 3M AT THE OPTION OF THE HOLDER

         In the event of a change in control, as defined below, occurring on or
prior to November 21, 2007 with respect to 3M, each holder will have the right,
at its option, subject to the terms and conditions of the indenture, to require
us to purchase for cash all or any portion of the holder's LYONs in integral
multiples of $1,000 principal amount at maturity, at a price for each $1,000
principal amount at maturity of such LYONs equal to the issue price plus accrued
original issue discount to the purchase date.

18


         We are required to purchase the LYONs no later than 35 business days
after the occurrence of such change in control (a "change in control purchase
date") at a cash price equal to the issue price plus accrued original issue
discount to the change of control purchase date.

         Within 15 business days after the occurrence of a change in control, we
must mail to the trustee and to all holders of LYONs at their addresses shown in
the register of the registrar and to beneficial owners as required by applicable
law a notice regarding the change in control, which notice shall state, among
other things:

         o    the events causing a change in control;

         o    the date of such change in control;

         o    the last date on which a holder may exercise the purchase right;

         o    the change in control purchase price;

         o    the change in control purchase date;

         o    the name and address of the paying agent and the conversion
              agent;

         o    the conversion rate and any adjustments to the conversion rate;

         o    that LYONs with respect to which a change in control purchase
              notice is given by the holder may be converted, if otherwise
              convertible, only if the change in control purchase notice has
              been withdrawn in accordance with the terms of the indenture; and

         o    the procedures that holders must follow to exercise these rights.

         To exercise this right, the holder must deliver a written notice to the
paying agent no later than the close of business on the change in control
purchase date. The required purchase notice upon a change in control must state:

         o    the certificate numbers of the LYONs to be delivered by the
              holder;

         o    the portion of the principal amount at maturity of LYONs to be
              purchased, which portion must be $1,000 or an integral multiple
              of $1,000; and

         o    that we are to purchase the LYONs pursuant to the applicable
              provisions of the LYONs.

         A holder may withdraw any change in control purchase notice by
delivering to the paying agent a written notice of withdrawal prior to the close
of business on the change in control purchase date. The notice of withdrawal
must state:

         o    the principal amount at maturity of the LYONs being withdrawn;

         o    the certificate numbers of the LYONs being withdrawn; and

         o    the principal amount at maturity, if any, of the LYONs that
              remain subject to a change in control purchase notice.

         Our obligation to pay the change in control purchase price for a LYON
for which a change in control purchase notice has been delivered and not validly
withdrawn is conditioned upon delivery of the LYON, together with necessary
endorsements, to the paying agent at any time after the delivery of such change
in control purchase notice. We will cause the change in control purchase price
for such LYON to be paid promptly following the later of the change in control
purchase date or the time of delivery of such LYON.

         If the paying agent holds money sufficient to pay the change in control
purchase price of the LYON on the change in control purchase date in accordance
with the terms of the indenture, then, immediately after the change in control
purchase date, original issue discount on such LYON will cease to accrue,
whether or not the LYON is delivered to the paying agent. Thereafter, all other
rights of the holder shall terminate, other than the right to receive the change
in control purchase price upon delivery of the LYON.

19


         Under the indenture, a "change in control" of 3M is deemed to have
occurred at such time as:

         o    any person, including its respective affiliates and associates,
              other than 3M, its subsidiaries or their employee benefit plans,
              files a Schedule 13D or Schedule TO (or any successor schedule,
              form or report under the Exchange Act) disclosing that such
              person has become the beneficial owner of 50% or more of the
              aggregate voting power of our common stock and other capital
              stock with equivalent voting rights, or other capital stock into
              which the common stock is reclassified or changed, with certain
              exceptions; or

         o    there shall be consummated any share exchange, consolidation or
              merger of 3M pursuant to which the common stock would be
              converted into cash, securities or other property in which the
              holders of our common stock and other capital stock with
              equivalent voting rights immediately prior to the share exchange,
              consolidation or merger, have, directly or indirectly, less than
              a majority of the total voting power in the aggregate of all
              classes of capital stock of the continuing or surviving
              corporation immediately after the share exchange, consolidation
              or merger.

         For purposes of defining a change in control:

         o    the term "person" and the term "group" have the meanings given by
              Section 13(d) and 14(d) of the Exchange Act or any successor
              provisions;

         o    the term "group" includes any group acting for the purpose of
              acquiring, holding or disposing of securities within the meaning
              of Rule 13d-5(b)(1) under the Exchange Act or any successor
              provision; and

         o    the term "beneficial owner" is determined in accordance with
              Rules 13d-3 and 13d-5 under the Exchange Act or any successor
              provisions, except that a person will be deemed to have
              beneficial ownership of all shares that person has the right to
              acquire irrespective of whether that right is exercisable
              immediately or only after the passage of time.

         The indenture does not permit our board of directors to waive our
obligation to purchase LYONs at the option of holders in the event of a change
in control.

         In connection with any purchase offer in the event of a change in
control, we will to the extent applicable:

         o    comply with the provisions of Rule 13e-4, Rule 14e-1 and any
              other tender offer rules under the Exchange Act which may then be
              applicable;

         o    file Schedule TO or any other required schedule under the
              Exchange Act; and

         o    otherwise comply with all federal and state securities laws as
              necessary under the indenture to effect a change in control
              purchase of LYONs by us at the option of a holder.

         The change in control purchase feature of the LYONs may in certain
circumstances make more difficult or discourage a takeover of 3M. The change in
control purchase feature, however, is not the result of our knowledge of any
specific effort:

         o    to accumulate shares of our common stock;

         o    to obtain control of 3M by means of a merger, tender offer,
              solicitation or otherwise; or

         o    part of a plan by management to adopt a series of anti-takeover
              provisions.

         Instead, the change in control purchase feature is a standard term
contained in other LYONs offerings that have been marketed by Merrill Lynch. The
terms of the change in control purchase feature resulted from negotiations
between Merrill Lynch and us.

         We could, in the future, enter into certain transactions, including
certain recapitalizations, that would not constitute a change in control with
respect to the change in control purchase feature of the LYONs but that would
increase the amount of our (or our subsidiaries') outstanding indebtedness.

         We may not purchase LYONs at the option of holders upon a change in
control if there has occurred and is continuing an event of default with respect
to the LYONs, other than a default in the payment of the change in control
purchase price with respect to the LYONs.

20


MERGER AND SALES OF ASSETS BY 3M

         The indenture provides that we may consolidate with or merge into any
other person or convey, transfer or lease our properties and assets
substantially as an entirety to another person, provided that:

         o    the resulting, surviving or transferee person (if other than 3M)
              is organized and existing under the laws of the United States,
              any state thereof or the District of Columbia;

         o    such person assumes all obligations of 3M under the LYONs and the
              indenture; and

         o    3M or such successor person is not immediately thereafter in
              default under the indenture.

         Upon the assumption of the obligations of 3M by such a person in such
circumstances, subject to certain exceptions, 3M will be discharged from all
obligations under the LYONs and the indenture. Although such transactions are
permitted under the indenture, certain of the foregoing transactions occurring
on or prior to November 21, 2007 could constitute a change in control of 3M
permitting each holder to require 3M or such successor person to purchase the
LYONs of such holder as described above.

EVENTS OF DEFAULT

         The following are events of default for the LYONs:

         (1)  default in payment of the principal amount at maturity,
              redemption price, purchase price or change in control purchase
              price with respect to any LYONs when such becomes due and
              payable;

         (2)  default in payment of any contingent interest, which default
              continues for 30 days;

         (3)  our failure to comply with any of our other agreements in the
              LYONs or the indenture upon our receipt of notice of such default
              from the trustee or from holders of not less than 25% in
              aggregate principal amount at maturity of the LYONs then
              outstanding, and our failure to cure (or obtain a waiver of) such
              default within 90 days after we receive such notice;

         (4)  default under any indebtedness for borrowed money, including
              other series of debt securities, or under any mortgage, lien or
              other similar encumbrance, indenture or instrument
              ("Indebtedness"), including the indenture, which secures any
              Indebtedness for borrowed money, and which results in
              acceleration of the maturity of an outstanding principal amount
              of Indebtedness greater than $20 million, unless this
              acceleration is rescinded (or the Indebtedness is discharged)
              within 10 days after we have received written notice of the
              default in the manner specified in the indenture; or

         (5)  certain events of bankruptcy or insolvency affecting us or any of
              our "significant subsidiaries" (as such term is defined under
              Regulation S-X under the Securities Act).

         If an event of default shall have happened and be continuing, either
the trustee or the holders of not less than 25% in aggregate principal amount at
maturity of the LYONs then outstanding may declare the issue price of the LYONs
plus the original issue discount on the LYONs accrued through the date of such
declaration, and any accrued and unpaid contingent interest through the date of
such declaration, to be immediately due and payable. In the case of certain
events of bankruptcy or insolvency, the issue price of the LYONs plus the
original issue discount and any unpaid contingent interest accrued thereon
through the occurrence of such event shall automatically become and be
immediately due and payable.

BOOK-ENTRY SYSTEM

         The LYONs are issued only in the form of global securities held in
book-entry form. DTC or its nominee is the sole registered holder of the LYONs
for all purposes under the indenture. Owners of beneficial interests in the
LYONs represented by the global securities hold their interests pursuant to the
procedures and practices of DTC. As a result, beneficial interests in any such
securities are shown on, and transfers are effected only through, records
maintained by DTC and its direct and indirect participants and any such interest
may not be converted for certificated securities, except in limited
circumstances. Owners of beneficial interests must exercise any rights in
respect of their interests, including any right to convert or require purchase
of their interests in the LYONs, in accordance with the procedures and practices
of DTC. Beneficial owners are not holders and will not be entitled to any rights
provided to the holders of LYONs under the global securities or the indenture.
3M and the trustee, and any of their respective agents, may treat DTC as the
sole holder and registered owner of the global securities.

21


ISSUANCE OF CERTIFICATED SECURITIES FOR GLOBAL SECURITIES

         LYONs represented by one or more global securities are exchangeable for
LYONs represented by certificated securities in registered form with the same
terms only if:

         o    DTC is unwilling or unable to continue as depositary or if DTC
              ceases to be a clearing agency registered under the Exchange Act
              and a successor depositary is not appointed by us within 90 days;

         o    we decide to discontinue use of the system of book-entry transfer
              through DTC (or any successor depositary); or

         o    a default under the indenture occurs and is continuing.

         DTC has advised us as follows: DTC is a limited-purpose trust company
organized under the New York Banking Law, a "banking organization" within the
meaning of the New York Uniform Commercial Code, and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Exchange Act. DTC
facilitates the settlement of transactions among its participants through
electronic computerized book-entry changes in participants' accounts,
eliminating the need for physical movement of securities certificates. DTC
participants include securities brokers and dealers, including Merrill Lynch,
banks, trust companies, clearing corporations and other organizations, some of
whom and/or their representatives own DTC. Access to DTC's book-entry system is
also available to others, such as banks, brokers, dealers and trust companies
that clear through or maintain a custodial relationship with a participant,
either directly or indirectly.

MODIFICATION

         We and the trustee may enter into supplemental indentures that add,
change or eliminate provisions of the indenture or modify the rights of the
holders of the LYONs with the consent of the holders of at least a majority in
principal amount at maturity of the LYONs then outstanding. However, without the
consent of each holder affected thereby, no supplemental indenture may:

         o    alter the manner of calculation or rate of accrual of original
              issue discount or contingent interest on any LYON or extend the
              time of payment;

         o    make any LYON payable in money or securities other than that
              stated in the LYON;

         o    change the stated maturity of any LYON;

         o    reduce the principal amount at maturity, issue price, redemption
              price, purchase price or change in control purchase price with
              respect to any LYON;

         o    make any change that adversely affects the right of a holder to
              convert any LYON;

         o    make any change that adversely affects the right to require us to
              purchase a LYON;

         o    impair the right to receive payment with respect to the LYONs or
              the right to institute suit for the enforcement of any payment
              with respect to, or conversion of, the LYONs; or

         o    change the provisions in the indenture that relate to modifying
              or amending the indenture.

         Without the consent of any holder of LYONs, we and the trustee may
enter into supplemental indentures for any of the following purposes:

         o    to evidence a successor to us and the assumption by that
              successor of our obligations under the indenture and the LYONs;

         o    to add to our covenants for the benefit of the holders of the
              LYONs or to surrender any right or power conferred upon us;

         o    to secure our obligations in respect of the LYONs and the
              indenture;

         o    to make any changes or modifications to the indenture necessary
              in connection with the registration of the LYONs under the
              Securities Act and the qualification of the LYONs under the Trust
              Indenture Act as contemplated by the indenture;

22


         o    to cure any ambiguity, omission, defect or inconsistency in the
              indenture; and

         o    to provide the holders with additional rights to require us to
              purchase the LYONs on additional purchase dates.

         The holders of a majority in principal amount at maturity of the
outstanding LYONs may, on behalf of the holders of all LYONs, (i) waive
compliance by us with restrictive provisions of the indenture, as detailed in
the indenture and (ii) waive any past default under the indenture and its
consequences, except a default in the payment of the principal amount at
maturity, issue price, accrued and unpaid contingent interest, accrued original
issue discount, redemption price, purchase price or change in control purchase
price or obligation to deliver shares of common stock upon conversion with
respect to any LYON or in respect of any provision which under the indenture
cannot be modified or amended without the consent of the holder of each
outstanding LYON affected.

DISCHARGE OF THE INDENTURE

         We may satisfy and discharge our obligations under the indenture by
delivering to the trustee for cancellation all outstanding LYONs or by
depositing with the trustee, the paying agent or the conversion agent, if
applicable after the LYONs have become due and payable, whether at stated
maturity, or any redemption date, any purchase date, or a change in control
purchase date, or upon conversion or otherwise, cash or shares of our common
stock or government obligations (as applicable under the terms of the indenture)
sufficient to pay all of the outstanding LYONs and paying all other sums payable
under the indenture by us.

LIMITATIONS OF CLAIMS IN BANKRUPTCY

         If a bankruptcy proceeding is commenced in respect of 3M, the claim of
the holder of a LYON is, under Title 11 of the United States Code, limited to
the issue price of the LYON plus that portion of the original issue discount
that has accrued from the date of issue to the commencement of the proceeding,
plus accrued and unpaid contingent interest, if any.

INFORMATION CONCERNING THE TRUSTEE

         Citibank, N.A. is the trustee, registrar, paying agent and conversion
agent under the indenture. We may maintain deposit accounts and conduct other
banking transactions with the trustee in the normal course of business.

GOVERNING LAW

         The indenture and the LYONs are governed by, and construed in
accordance with, the law of the State of New York.

                        DESCRIPTION OF OUR CAPITAL STOCK

GENERAL

         The following description of our capital stock is subject to and
qualified in its entirety by our certificate of incorporation and bylaws, which
have been publicly filed with the SEC, and by the provisions of applicable
Delaware law. See "Where You Can Find More Information."

         Our authorized capital stock consists of:

         o    1,500,000,000 shares of common stock, $0.01 par value; and

         o    10,000,000 shares of preferred stock, no par value.

         Each holder of our common stock is entitled to one vote per share on
all matters to be voted upon by the stockholders. Subject to preferences that
may be applicable to any outstanding preferred stock, the holders of our common
stock are entitled to receive ratably such dividends, if any, as may be declared
from time to time by the board of directors out of funds legally available for
that purpose. In the event of our liquidation, dissolution or winding up, the
holders of our common stock are entitled to share ratably in all assets
remaining after payment of liabilities, subject to prior distribution rights of
preferred stock, if any, then outstanding. The holders of our common stock have
no preemptive or conversion rights or other subscription rights. There are no
redemption or sinking fund provisions applicable to the common stock.

PREFERRED STOCK

         The board of directors has the authority, without action by the
stockholders, to designate and issue preferred stock in one or more series and
to designate the rights, preferences and privileges of each series, which may be
greater than the rights of

23


the common stock. It is not possible to state the actual effect of the issuance
of any shares of preferred stock upon the rights of holders of the common stock
until the board of directors determines the specific rights of the holders of
such preferred stock. However, the effects might include, among other things:

         o    restricting dividends on the common stock;

         o    diluting the voting power of the common stock;

         o    impairing the liquidation rights of the common stock; or

         o    delaying or preventing a change in control of us without further
              action by the stockholders.

         Certain other provisions of our certificate of incorporation and bylaws
could also delay or prevent a change in control. These include a provision of
our certificate of incorporation that requires, absent prior board approval, the
approval of any merger, sale or certain other business combinations by holders
of at least 80% of our outstanding common stock.

         No shares of preferred stock are outstanding, and we have no present
plans to issue any shares of preferred stock.

TRANSFER AGENT AND REGISTRAR

         The transfer agent and registrar for our common stock is Wells Fargo
Bank N.A. Shareowner Services.

             CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS

GENERAL

         This is a summary of certain United States federal income tax
consequences relevant to holders of LYONs. This summary is based upon laws,
regulations, rulings and decisions now in effect, all of which are subject to
change (including retroactive changes) or possible differing interpretations.
The discussion below deals only with LYONs held as capital and does not purport
to deal with persons in special tax situations, such as financial institutions,
insurance companies, regulated investment companies, dealers in securities or
currencies, tax-exempt entities, persons holding LYONs in a tax-deferred or
tax-advantaged account, or persons holding LYONs as a hedge against currency
risks, as a position in a "straddle" or as part of a "hedging" or "conversion"
transaction for tax purposes.

         We do not address all of the tax consequences that may be relevant to
an investor in LYONs. In particular, we do not address:

         o    the United States federal income tax consequences to shareholders
              in, or partners or beneficiaries of, an entity that is a holder
              of LYONs;

         o    the United States federal estate, gift or alternative minimum tax
              consequences of the purchase, ownership or disposition of LYONs;

         o    U.S. holders (as defined below) whose functional currency is not
              the United States dollar;

         o    any state, local or foreign tax consequences of the purchase,
              ownership or disposition of LYONs; or

         o    any United States federal, state, local or foreign tax
              consequences of owning or disposing of 3M common stock.

         Persons considering the purchase of the LYONs should consult their own
tax advisors concerning the application of the United States federal income tax
laws to their particular situations as well as any consequences of the purchase,
ownership and disposition of the LYONs arising under the laws of any other
taxing jurisdiction.

         A U.S. holder is a beneficial owner of the LYONs who or which is:

         o    a citizen or individual resident of the United States, as defined
              in section 7701(b) of the Internal Revenue Code of 1986, as
              amended (which we refer to as the Code);

         o    a corporation or partnership, including any entity treated as a
              corporation or partnership for United States federal income tax
              purposes, created or organized in or under the laws of the United
              States, any state thereof or the District of Columbia;

24


         o    an estate if its income is subject to United States federal
              income taxation regardless of its source; or

         o    a trust if (1) a United States court can exercise primary
              supervision over its administration, and (2) one or more United
              States persons have the authority to control all of its
              substantial decisions.

         Notwithstanding the preceding sentence, certain trusts in existence on
August 20, 1996, and treated as U.S. persons prior to such date, may also be
treated as U.S. holders. A Non-U.S. holder is a beneficial owner of LYONs other
than a U.S. holder.

         WE URGE PROSPECTIVE INVESTORS TO CONSULT THEIR OWN TAX ADVISORS WITH
RESPECT TO THE TAX CONSEQUENCES TO THEM OF THE PURCHASE, OWNERSHIP AND
DISPOSITION OF THE LYONS AND 3M COMMON STOCK IN LIGHT OF THEIR OWN PARTICULAR
CIRCUMSTANCES, INCLUDING THE TAX CONSEQUENCES UNDER STATE, LOCAL, FOREIGN AND
OTHER TAX LAWS AND THE POSSIBLE EFFECTS OF CHANGES IN UNITED STATES FEDERAL OR
OTHER TAX LAWS.

CLASSIFICATION OF THE LYONS

         We have received an opinion from our Tax Counsel, Henry W. Gjersdal,
Jr., that the LYONs will be treated as indebtedness for United States federal
income tax purposes and that the LYONs will be subject to the special
regulations governing contingent payment debt instruments (which we refer to as
the "CPDI" regulations). Pursuant to the terms of the indenture, we and each
holder of the LYONs agree, for United States federal income tax purposes, to
treat the LYONs as debt instruments that are subject to the CPDI regulations. In
addition, under the indenture, each holder will be deemed to have agreed to
treat the fair market value of our common stock received by such holder upon
conversion as a contingent payment and to accrue interest with respect to the
LYONs as original issue discount for United States federal income tax purposes
according to the "noncontingent bond method," set forth in section 1.1275-4(b)
of the Treasury Regulations, using the comparable yield (as defined below)
compounded semiannually and the projected payment schedule (as defined below)
determined by us.

         Recently, the Internal Revenue Service (which we refer to as the "IRS")
issued Revenue Ruling 2002-31 and Notice 2002-36 addressing the United States
federal income tax classification and treatment of instruments substantially
similar to the LYONs, and concluded that the instruments addressed in that
published guidance were subject to the CPDI regulations. In addition, the IRS
clarified various aspects of the potential applicability of certain other
provisions of the Code to instruments addressed in that published guidance.
However, Revenue Ruling 2002-31 is limited to its particular facts. In addition,
no rulings have been sought or are expected to be sought from the IRS with
respect to any of the United States federal income tax consequences discussed
below. As a result, no assurance can be given that the IRS or a court will agree
with the tax characterizations and the tax treatment described below. The
remainder of this discussion assumes that the LYONs are subject to the CPDI
regulations. Any differing treatment could affect the amount, timing and
character of income, gain or loss in respect of an investment in the LYONs. In
particular, a holder might be required to accrue interest income at a higher or
lower rate, might not recognize income, gain or loss upon conversion of the
LYONs into common stock, and might recognize capital gain or loss upon a taxable
disposition of the LYONs. Holders should consult their tax advisors concerning
the tax treatment of holding the LYONs.

ACCRUAL OF INTEREST ON THE LYONS

         Pursuant to the CPDI regulations, a U.S. holder will be required to
accrue interest income on the LYONs, in the amounts described below, regardless
of whether the U.S. holder uses the cash or accrual method of tax accounting.
Accordingly, U.S. holders will be required to include interest in taxable income
in each year in excess of the accruals on the LYONs for non-tax purposes and in
excess of any contingent interest payments actually received in that year.

         The CPDI regulations provide that a U.S. holder must accrue an amount
of ordinary interest income, as original issue discount for United States
federal income tax purposes, for each accrual period prior to and including the
maturity date of the LYONs that equals:

                  (1) the product of (i) the adjusted issue price (as defined
         below) of the LYONs as of the beginning of the accrual period, and (ii)
         the comparable yield to maturity (as defined below) of the LYONs,
         adjusted for the length of the accrual period;

                  (2) divided by the number of days in the accrual period; and

                  (3) multiplied by the number of days during the accrual period
         that the U.S. holder held the LYONs.

         A LYON's issue price is the first price at which a substantial amount
of the LYONs is sold to the public, excluding sales to bond houses, brokers or
similar persons or organizations acting in the capacity of underwriters,
placement agents or wholesalers. The adjusted issue price of a LYON is its issue
price increased by any interest income previously accrued,

25


determined without regard to any adjustments to interest accruals described
below, and decreased by the amount of any projected payments, as defined below,
previously made on the LYONs.

         Henry W. Gjersdal, Jr., our Tax Counsel, has advised us that the term
"comparable yield" means the annual yield we would pay, as of the initial issue
date, on a noncontingent, nonconvertible, fixed-rate debt security with terms
and conditions otherwise comparable to those of the LYONs. Moreover, Henry W.
Gjersdal, Jr., our Tax Counsel, has advised us that the comparable yield must be
a reasonable yield for us and must not be less than the applicable Federal rate
(based on the overall maturity of the LYONs). Based in part on that advice, we
intend to take the position that the comparable yield for the LYONs is 4.55%,
compounded semiannually (which equals the required minimum yield equal to the
applicable Federal rate described above). The precise manner of calculating the
comparable yield is not entirely clear. If the comparable yield were
successfully challenged by the IRS, the redetermined yield could be materially
greater or less than the comparable yield provided by us. Moreover, in such
event, the projected payment schedule could differ materially from the projected
payment schedule provided by us.

         The CPDI regulations require that we provide to U.S. holders, solely
for United States federal income tax purposes, a schedule of the projected
amounts of payments, which we refer to as projected payments, on the LYONs. This
schedule must produce the comparable yield. The projected payment schedule
includes estimates for certain contingent interest payments and an estimate for
a payment at maturity taking into account the conversion feature. In this
connection, the fair market value of any common stock (and cash, if any)
received by a holder upon conversion will be treated as a contingent payment.

         The comparable yield and the schedule of projected payments will be set
forth in the indenture. U.S. holders may also obtain the projected payment
schedule by submitting a written request for such information to: 3M Company, 3M
Center. St. Paul, Minnesota 55144, Attention: Corporate Secretary.

         For United States federal income tax purposes, a U.S. holder must use
the comparable yield and the schedule of projected payments in determining its
interest accruals, and the adjustments thereto described below, in respect of
the LYONs, unless such U.S. holder timely discloses and justifies the use of
other estimates to the IRS. A U.S. holder that determines its own comparable
yield or schedule of projected payments must also establish that our comparable
yield or schedule of projected payments is unreasonable.

         THE COMPARABLE YIELD AND THE SCHEDULE OF PROJECTED PAYMENTS ARE NOT
DETERMINED FOR ANY PURPOSE OTHER THAN FOR THE DETERMINATION OF A U.S. HOLDER'S
INTEREST ACCRUALS AND ADJUSTMENTS THEREOF IN RESPECT OF THE LYONS FOR UNITED
STATES FEDERAL INCOME TAX PURPOSES AND DO NOT CONSTITUTE A PROJECTION OR
REPRESENTATION REGARDING THE ACTUAL AMOUNTS PAYABLE ON THE LYONS.

         Amounts treated as interest under the CPDI regulations are treated as
original issue discount for all purposes of the Code.

ADJUSTMENTS TO INTEREST ACCRUALS ON THE LYONS

         If, during any taxable year, a U.S. holder receives actual payments
with respect to the LYONs for that taxable year that in the aggregate exceed the
total amount of projected payments for that taxable year, the U.S. holder will
incur a "net positive adjustment" under the CPDI regulations equal to the amount
of such excess. The U.S. holder will treat a "net positive adjustment" as
additional interest income for the taxable year. For this purpose, the payments
in a taxable year include the fair market value of property received in that
year, including the fair market value of our common stock received upon
conversion or redemption.

         If a U.S. holder receives in a taxable year actual payments with
respect to the LYONs for that taxable year that in the aggregate are less than
the amount of projected payments for that taxable year, the U.S. holder will
incur a "net negative adjustment" under the CPDI regulations equal to the amount
of such deficit. This adjustment will (a) first reduce the U.S. holder's
interest income on the LYONs for that taxable year, and (b) to the extent of any
excess after the application of (a), give rise to an ordinary loss to the extent
of the U.S. holder's interest income on the LYONs during prior taxable years,
reduced to the extent such interest was offset by prior net negative
adjustments. A negative adjustment is not subject to the two percent floor
limitation imposed on miscellaneous itemized deductions under section 67 of the
Code. Any negative adjustment in excess of the amounts described in (a) or (b)
will be carried forward to offset future interest income accruals in respect of
the LYONs or to reduce the amount realized on the sale, exchange, conversion or
retirement of the LYONs.

         If a U.S. holder purchases LYONs at a discount or premium to the
adjusted issue price, the discount will be treated as a positive adjustment and
the premium will be treated as a negative adjustment. The U.S. holder must
reasonably allocate the adjustment over the remaining term of the LYONs by
reference to the accruals of original issue discount at the comparable yield or
to the projected payments. It may be reasonable to allocate the adjustment over
the remaining term of the LYONs pro rata with the accruals of original issue
discount at the comparable yield. Holders should consult their tax advisors
regarding those allocations.

26


SALE, EXCHANGE, CONVERSION OR REDEMPTION

         Generally, the sale or exchange of a LYON, or the redemption of a LYON
for cash, will result in taxable gain or loss to a U.S. holder. As described
above, our calculation of the comparable yield and the schedule of projected
payments for the LYONs includes the receipt of common stock upon conversion as a
contingent payment with respect to the LYONs. Accordingly, we intend to treat
the receipt of our common stock by a U.S. holder upon the conversion of a LYON,
or upon the U.S. holder's exercise of a put right where we elect to pay in
common stock, as a contingent payment under the CPDI regulations. Under this
treatment, conversion or such an exercise of the U.S. holder's put right also
would result in taxable gain or loss to the U.S. holder. As described above,
holders will be deemed to have agreed to be bound by our determination of the
comparable yield and the schedule of projected payments.

         The amount of gain or loss on a taxable sale, exchange, conversion or
redemption will be equal to the difference between (a) the amount of cash plus
the fair market value of any other property received by the U.S. holder,
including the fair market value of any of our common stock received, and (b) the
U.S. holder's adjusted tax basis in the LYON. A U.S. holder's adjusted tax basis
in a LYON will generally be equal to the U.S. holder's original purchase price
for the LYON, increased by any interest income previously accrued by the U.S.
holder (determined without regard to any adjustments to interest accruals
described above, other than adjustments to reflect a discount or premium to the
adjusted issue price, if any), and decreased by the amount of any projected
payments, as defined above, previously made on the LYONs to the U.S. Holder
through such date (without regard to the actual amount paid). Gain recognized
upon a sale, exchange, conversion or redemption of a LYON will generally be
treated as ordinary interest income; any loss will be ordinary loss to the
extent of interest previously included in income, and thereafter, capital loss
(which will be long-term if the LYON is held for more than one year). The
deductibility of net capital losses by individuals and corporations is subject
to limitations.

         A U.S. holder's tax basis in our common stock received upon a
conversion of a LYON or upon a U.S. holder's exercise of a put right that we
elect to pay in our common stock will equal the then current fair market value
of such common stock. The U.S. holder's holding period for the common stock
received will commence on the day immediately following the date of conversion
or redemption.

CONSTRUCTIVE DIVIDENDS

         If at any time we were to make a distribution of property to our
stockholders that would be taxable to the stockholders as a dividend for United
States federal income tax purposes and, in accordance with the anti-dilution
provisions of the LYONs, the conversion rate of the LYONs were increased, such
increase may be deemed to be the payment of a taxable dividend to holders of the
LYONs.

         For example, an increase in the conversion rate in the event of
distributions of our evidences of indebtedness, or our assets, or an increase in
the event of an extraordinary cash dividend may result in deemed dividend
treatment to holders of the LYONs, but generally an increase in the event of
stock dividends or the distribution of rights to subscribe for common stock
would not be so treated.

TREATMENT OF NON-U.S. HOLDERS

         Payments of contingent interest made to Non-U.S. holders in excess of
the floor amount (i.e., an amount equal to $0.62 multiplied by 4.7301), if any,
will not be exempt from United States federal income or withholding tax and,
therefore, Non-U.S. holders will be subject to withholding on such payments of
contingent interest at a rate of 30%, subject to reduction by an applicable
treaty or upon the receipt of a Form W-8ECI from a Non-U.S. holder claiming that
the payments are effectively connected with the conduct of a United States trade
or business. A Non-U.S. holder that is subject to the withholding tax should
consult its tax advisor as to whether it can obtain a refund for a portion of
the withholding tax, either on the grounds that some portion of the contingent
interest represents a return of principal under the CPDI regulations, or on
other grounds.

         All other payments on the LYONs made to a Non-U.S. holder, including
the portion of any payment of contingent cash interest equal to the floor amount
(i.e., the amount equal to $0.62 multiplied by 4.7301), a payment in our common
stock pursuant to a conversion, and any gain realized on a sale, exchange,
redemption or conversion of the LYONs (other than income or gain attributable to
accrued contingent interest payments), will be exempt from United States income
or withholding tax PROVIDED that: (i) such Non-U.S. holder does not own,
actually, indirectly or constructively, 10% or more of the total combined voting
power of all classes of our stock entitled to vote, is not a controlled foreign
corporation related, directly or indirectly, to us through stock ownership and
is not a bank receiving interest described in section 881(c)(3)(A) of the Code,
(ii) the statement requirement set forth in section 871(h) or section 881(c) of
the Code has been fulfilled with respect to the beneficial owner, as discussed
below; (iii) such payments and gain are not effectively connected with the
conduct by such Non-U.S. holder of a trade or business in the United States;
(iv) our common stock continues to be actively traded within the meaning of
section 871(h)(4)(C)(v)(I) of the Code (which, for these purposes and subject to
certain exceptions, includes trading on the NYSE); and (v) we are not a "United
States

27


real property holding corporation." We believe that we are not and do not
anticipate becoming a "United States real property holding corporation."
However, if a Non-U.S. holder were deemed to have received a constructive
dividend (see "--Constructive Dividends" above), the Non-U.S. holder will
generally be subject to United States federal withholding tax at a 30% rate on
the taxable amount of such dividend, subject to reduction by an applicable
treaty or upon the receipt of a Form W-8ECI from the Non-U.S. holder claiming
that the deemed receipt of the constructive dividend is effectively connected
with the conduct of a United States trade or business.

         The statement requirement referred to in the preceding paragraph will
be fulfilled if the beneficial owner of a LYON certifies on IRS Form W-8BEN,
under penalties of perjury, that it is not a United States person and provides
its name and address or otherwise satisfies applicable documentation
requirements. If a Non-U.S. holder of the LYONs is engaged in a trade or
business in the United States, and if interest on the LYONs is effectively
connected with the conduct of such trade or business, the Non-U.S. holder,
although exempt from the withholding tax discussed in the preceding paragraphs,
will generally be subject to regular United States federal income tax on
interest and on any gain realized on the sale, exchange, redemption or
conversion of the LYONs in the same manner as if it were a U.S. holder. In lieu
of the certificate described in the preceding paragraph, such a Non-U.S. holder
will be required to provide to the withholding agent a properly executed IRS
Form W-8ECI (or successor form) in order to claim an exemption from withholding
tax. In addition, if such a Non-U.S. holder is a foreign corporation, such
Non-U.S. holder may be subject to a branch profits tax equal to 30% (or such
lower rate provided by an applicable treaty) of its effectively connected
earnings and profits for the taxable year, subject to certain adjustments.

BACKUP WITHHOLDING TAX AND INFORMATION REPORTING

         Payments of principal, premium, if any, and interest (including
original issue discount, tax original issue discount and a payment in common
stock pursuant to a conversion of the LYONs) on, and the proceeds of
dispositions of, the LYONs may be subject to information reporting and United
States federal backup withholding tax if the U.S. holder thereof fails to supply
an accurate taxpayer identification number or otherwise fails to comply with
applicable United States information reporting or certification requirements. A
Non-U.S. holder may be subject to United States backup withholding tax on
payments on the LYONs and the proceeds from a sale or other disposition of the
LYONs unless the Non-U.S. holder complies with certification procedures to
establish that it is not a United States person. Any amounts so withheld will be
allowed as a credit against a U.S. holder's United States federal income tax
liability and may entitle a holder to a refund, provided the required
information is timely furnished to the IRS.

                            SELLING SECURITY HOLDERS

         The LYONs were originally issued by us to Merrill Lynch in a
transaction exempt from the registration requirements of the Securities Act and
were immediately resold by Merrill Lynch in reliance on Rule 144A to persons who
represented to Merrill Lynch that they were qualified institutional buyers. When
we refer to "selling security holders" in this prospectus, we mean those persons
listed in the table below, as well as the pledgees, donees, assignees,
transferees, successors and others who later hold any of the selling security
holders interests. The selling security holders may from time to time offer and
sell pursuant to this prospectus any or all of the LYONs held by that selling
security holder and the common stock into which the LYONs are convertible.

         The following table sets forth information as of August 11, 2003, with
respect to the selling security holders and the principal amounts of LYONs
beneficially owned by each selling security holder that may be offered under
this prospectus. This information is based on information required to be
provided to us by or on behalf of the selling security holders pursuant to
questionnaires. No holder of the LYONs may sell the LYONs or shares without
furnishing to us a questionnaire setting forth the information specified below.
However, as of the date of this prospectus, not every holder has provided to us
a questionnaire. Therefore, the heading "Other" in the "Name" column below
represents the LYONs and shares held by holders who have not yet returned to us
their questionnaire.

         The selling security holders may offer all, some or none of the LYONs
or common stock into which the LYONs are convertible. In addition, the selling
security holders may have sold, transferred or otherwise disposed of all or a
portion of their notes since the date on which they provided the information
regarding their LYONs in transactions exempt from the registration requirements
of the Securities Act. No selling security holder beneficially owns one percent
or more of our common stock, assuming conversion of the selling security
holders' LYONs.

         Information concerning the selling security holders may change from
time to time and any changed information with respect to substitution will be
set forth in supplements to this prospectus if and when necessary. Other selling
security holders may be identified at a later date and will be included in a
post-effective amendment to the registration statement. In addition, the
conversion rate and, therefore, the number of shares of common stock issuable
upon conversion of the LYONs, is subject to adjustment under certain
circumstances.

         As of August 19, 2003, $167,667,000 principal amount at maturity of
LYONs have previously been sold in public offerings pursuant to the registration
statement of which this prospectus forms a part.

28




                                       PRINCIPAL      SHARES OF      SHARES OF
                                       AMOUNT OF     COMMON STOCK     COMMON                         COMMON
                                         LYONS       BENEFICIALLY  STOCK OFFERED      LYONS        STOCK OWNED
                                      BENEFICIALLY   OWNED UPON        UPON        OWNED AFTER        AFTER
                                       OWNED AND    CONVERSION OF  CONVERSION OF  COMPLETION OF  OF COMPLETION      MATERIAL
NAME                                    OFFERED       LYONS (1)      LYONS (1)      OFFERING (2)  OFFERING (2)   RELATIONSHIP (3)
----                                  ------------  -------------  -------------  -------------- -------------   ----------------
                                                                                                  
Akela Capital Master Fund, Ltd.         5,000,000     47,301.0      47,301.0            0             -               None
Allstate Life Insurance Company (4)     1,250,000     11,825.3      11,825.3            0             -               None
Arbitex Master Fund, L.P. (4)          19,100,000    180,689.8     180,689.8            0             -               None
Argent Classic Convertible              3,300,000     31,218.7      31,218.7            0             -               None
Arbitrage Fund (Bermuda) Ltd.
Argent Low Lev Convertible                900,000     8,514.2        8,514.2            0             -               None
Arbitrage Fund LLC
Argent Low Lev Convertible              5,500,000     52,031.1      52,031.1            0             -               None
Arbitrage Fund Ltd.
Arpeggio Fund (4)                       7,700,000     72,843.5      72,843.5            0             -               None
Aviva Life Insurance Co.                3,000,000     28,380.6      28,380.6            0             -               None
Banc of America Securities, LLC (5)     2,500,000     23,650.5      23,650.5            0             -               None
Beamten Versicherungskasse Des          4,900,000     46,355.0      46,355.0            0             -               None
Kantons Zurich
Bernische Lehrer Versicherungskasse       540,000     5,108.5        5,108.5            0             -               None
California State Auto Assoc ASNF           30,000       283.8          283.8            0             -               None
c/o Victory Capital Management
California State Auto Assoc               415,000     3,926.0        3,926.0            0             -               None
Inter-Insurance c/o Victory Capital
Management
Canyon Capital Arbitrage Master         9,000,000    85,141.8       85,141.8            0             -               None
Fund, Ltd. (4)
Canyon Value Realization Fund          13,500,000   127,712.7      127,712.7            0             -               None
(Cayman), Ltd. (4)
Canyon Value Realization Fund, L.P.     6,000,000    56,761.2       56,761.2            0             -               None
(4)
Canyon Value Realization MAC 18,        1,500,000    14,190.3       14,190.3            0             -               None
Ltd. (RMF) (4)
CGNU Life Fund                          2,600,000    24,596.5       24,596.5            0             -               None
Charitable Convertible Securities         930,000     8,798.0        8,798.0            0             -               None
Fund c/o Victory Capital Management
Charitable Income Fund c/o Victory        210,000     1,986.6        1,986.6            0             -               None
Capital Management
Citigroup Global Markets, Fmr          13,688,000   129,491.2      129,491.2            0             -               None
Salomon Smith Barney (5)
Clinton Multistrategy Master Fund,     10,000,000    94,602.0       94,602.0            0             -               None
Ltd.
Clinton Riverside Convertible          10,000,000    94,602.0       94,602.0            0             -               None
Portfolio Limited
Commercial Union Life Fund              3,200,000    30,272.6       30,272.6            0             -               None
Commonwealth Professional Assurance       570,000     5,392.3        5,392.3            0             -               None
Co. c/o Income Research & Mgmt
CompSource Oklahoma c/o Victory           760,000     7,189.8        7,189.8            0             -               None
Capital Management
Continental Assurance Company on          900,000     8,514.2        8,514.2            0             -               None
Behalf of its Separate Account (4)
Continental Casualty Company (4)        9,100,000    86,087.8       86,087.8            0             -               None
CSV Limited (4)                         1,600,000    15,136.3       15,136.3            0             -               None
Deutsche Bank AG - London (4)           8,000,000    75,681.6       75,681.6            0             -               None
DNB Investment                            500,000     4,730.1        4,730.1            0             -               None
Dodeca Fund, L.P.                       2,900,000    27,434.6       27,434.6            0             -               None
EB Convertible Securities Fund c/o      1,275,000    12,061.8       12,061.8            0             -               None
Victory Capital Management
Excellus Health Plan c/o Income         2,450,000    23,177.5       23,177.5            0             -               None
Research & Mgmt
Field Foundation of Illinois c/o           65,000       614.9          614.9            0             -               None
Victory Capital Management
GenCorp Foundation c/o Victory             55,000       520.3          520.3            0             -               None
Capital Management
Georgia Municipal Employees               590,000     5,581.5        5,581.5            0             -               None
Retirement Trust Fdn c/o Victory
Capital Management





29





                                       PRINCIPAL      SHARES OF      SHARES OF
                                       AMOUNT OF     COMMON STOCK     COMMON                         COMMON
                                         LYONS       BENEFICIALLY  STOCK OFFERED      LYONS        STOCK OWNED
                                      BENEFICIALLY   OWNED UPON        UPON        OWNED AFTER        AFTER
                                       OWNED AND    CONVERSION OF  CONVERSION OF  COMPLETION OF  OF COMPLETION      MATERIAL
NAME                                    OFFERED       LYONS (1)      LYONS (1)      OFFERING (2)  OFFERING (2)   RELATIONSHIP (3)
----                                  ------------  -------------  -------------  -------------- -------------   ----------------
                                                                                                    
Goldman Sachs, & Co. (5)                7,380,000    69,816.3       69,816.3            0             -               None
Government of Singapore Investment      1,200,000    11,352.2       11,352.2            0             -               None
Corporation Pte Ltd
Hamilton Multi-Strategy Master            100,000       946.0          946.0            0             -               None
Fund, L.P.
Health Foundation of Greater              165,000     1,560.9        1,560.9            0             -               None
Cincinnati c/o Victory Capital
Management
IMF Convertible Fund (4)                  800,000     7,568.2        7,568.2            0             -               None
Investcorp - SAM Fund Ltd. (4)          3,400,000    32,164.7       32,164.7            0             -               None
Jefferies Umbrella Fund Global          1,090,000    10,311.6       10,311.6            0             -               None
Convertible Bond
JMG Convertible Investments, LP         7,250,000    68,586.5       68,586.5            0             -               None
KBC Financial Products USA Inc (5)        700,000     6,622.1        6,622.1            0             -               None
Key Trust Convertible Securities          235,000     2,223.1        2,223.1            0             -               None
Fund c/o Victory Capital Management
Key Trust Fixed Income Fund c/o           285,000     2,696.2        2,696.2            0             -               None
Victory Capital Management
Lehman Brothers Inc (5)                29,625,000   280,258.4      280,258.4            0             -               None
Lyxor Master Fund (4)                   5,000,000    47,301.0       47,301.0            0             -               None
Lyxor Master Fund Ref:  Argent          1,200,000    11,352.2       11,352.2            0             -               None
LowLev CB c/o Argent
MAG Mutual Insurance Company               75,000       709.5          709.5            0             -               None
McMahan Securities Co. L.P. (5)         1,500,000    14,190.3       14,190.3            0             -               None
Med America Insurance Co. c/o           1,505,000    14,237.6       14,237.6            0             -               None
Income Research & Mgmt
Med America Insurance Co. Hartford        285,000     2,696.2        2,696.2            0             -               None
Trust c/o Income Research & Mgmt
Med America New York c/o Income           920,000     8,703.4        8,703.4            0             -               None
Research & Mgmt
Medical Liability Ins. Co.              7,250,000    68,586.5       68,586.5            0             -               None
Merrill Lynch Pierce Fenner & Smith     7,255,000    68,633.8       68,633.8            0             -          Aulana Peters
Inc. (5)                                                                                                         is a director
                                                                                                                  of Merrill
                                                                                                                 Lynch & Co and
                                                                                                                   has been a
                                                                                                                 director of 3M
                                                                                                                  since 1990.
                                                                                                                    Further,
                                                                                                                 Merrill Lynch
                                                                                                                Pierce Fenner &
                                                                                                                  Smith may or
                                                                                                                  may not have
                                                                                                                  acted in a
                                                                                                                   financial
                                                                                                                   investment
                                                                                                                    advisory
                                                                                                                 capacity to 3M
                                                                                                                 within the past
                                                                                                                    3 years.
Morgan Stanley Dean Witter              3,000,000    28,380.6       28,380.6            0             -               None
Convertible Securities Trust (4)
NACM Investment Grade Convertible          10,000        94.6           94.6            0             -               None
Nomura Securities Intl Inc (5)         10,000,000    94,602.0       94,602.0            0             -               None
Norwich Union Life & Pensions           4,500,000    42,570.9       42,570.9            0             -               None
NTCC Aquilla                              100,000       946.0          946.0            0             -               None
Ohio Insurance Co.                        375,000     3,547.6        3,547.6            0             -               None
Pacific Life Insurance Company (4)      1,000,000     9,460.2        9,460.2            0             -               None
Partners Group Alternative                200,000     1,892.0        1,892.0            0             -               None
Strategies PCC, Ltd.
Pensionskasse Der Antaus AG                70,000       662.2          662.2            0             -               None
Pensionskasse Der EMS - Chemie AG          90,000       851.4          851.4            0             -               None
Pensionskasse Der EMS - Dottikon AG       130,000     1,229.8        1,229.8            0             -               None
Pensionskasse Der Lonza                   170,000     1,608.2        1,608.2            0             -               None
Pensionskasse Der Rockwell                 90,000       851.4          851.4            0             -               None
Automation AG
Pensionskasse Pluss - Staufer AG           80,000       756.8          756.8            0             -               None
Pensionskasse Vantico                     130,000     1,229.8        1,229.8            0             -               None
Performance Capital Group LLC (5)       5,000,000    47,301.0       47,301.0            0             -               None
Personalfursorge - Stiftung Der           270,000     2,554.3        2,554.3            0             -               None
Gebaudeversicherung Des Kantons Bern
Personalvorsorge Der PV Promea            160,000     1,513.6        1,513.6            0             -               None
PLICA                                      40,000       378.4          378.4            0             -               None
Potlatch c/o Victory Capital              750,000     7,095.2        7,095.2            0             -               None
Management





30





                                       PRINCIPAL      SHARES OF      SHARES OF
                                       AMOUNT OF     COMMON STOCK     COMMON                         COMMON
                                         LYONS       BENEFICIALLY  STOCK OFFERED      LYONS        STOCK OWNED
                                      BENEFICIALLY   OWNED UPON        UPON        OWNED AFTER        AFTER
                                       OWNED AND    CONVERSION OF  CONVERSION OF  COMPLETION OF  OF COMPLETION      MATERIAL
NAME                                    OFFERED       LYONS (1)      LYONS (1)      OFFERING (2)  OFFERING (2)   RELATIONSHIP (3)
----                                  ------------  -------------  -------------  -------------- -------------   ----------------
                                                                                                    
Primex                                     60,000       567.6          567.6            0             -               None
Princeton Medical Liability             1,450,000    13,717.3       13,717.3            0             -               None
Insurance
Privelege Portfolio SICAV               8,000,000    75,681.6       75,681.6            0             -               None
Quattro Fund Ltd.                       7,200,000    68,113.4       68,113.4            0             -               None
Quest Global Convertible Master         2,000,000    18,920.4       18,920.4            0             -               None
Fund, Ltd.
RBC Alternative Assets LP (4)             200,000     1,892.0        1,892.0            0             -               None
Reciprocal of America                     150,000     1,419.0        1,419.0            0             -               None
Rhapsody Fund, L.P. (4)                10,600,000   100,278.1      100,278.1            0             -               None
RHP Master Fund, Ltd.                   2,500,000    23,650.5       23,650.5            0             -               None
Royal Bank of Canada Toronto (4)       17,000,000   160,823.4      160,823.4            0             -               None
Sage Capital                            4,800,000    45,409.0       45,409.0            0             -               None
Salomon Brothers Asset Management,     39,000,000   368,947.8      368,947.8            0             -               None
Inc. (4)
Stamford Police Pension Fund c/o           60,000       567.6          567.6            0             -               None
Victory Capital Management
State of Georgia c/o Income               705,000     6,669.4        6,669.4            0             -               None
Research & Mgmt
Sutton Brook Capital Portfolio LP      35,000,000   331,107.0      331,107.0            0             -               None
Swiss Re Financial Products Corp        4,000,000    37,840.8       37,840.8            0             -               None
Teachers Insurance and Annuity         28,700,000   271,507.7      271,507.7            0             -               None
Association
The Reciprocal of America                 150,000     1,419.0        1,419.0            0             -               None
Thrivent Financial for Lutherans (4)    1,500,000    14,190.3       14,190.3            0             -               None
Topanga XI (4)                          1,600,000    15,136.3       15,136.3            0             -               None
Triborough Partner International LTD    5,110,000    48,341.6       48,341.6            0             -               None
Triborough Partners LLC                 1,890,000    17,879.8       17,879.8            0             -               None
Tufts Associated Health Plan c/o        1,335,000    12,629.4       12,629.4            0             -               None
Income Research & Mgmt
UBS O'Connor LLC F/B/O O'Connor           500,000     4,730.1        4,730.1            0             -               None
Global Convertible Portfolio
UMASS Memorial Health Care c/o            265,000     2,507.0        2,507.0            0             -               None
Income Research & Mgmt
UMASS Memorial Investment                 265,000     2,507.0        2,507.0            0             -               None
Partnership c/o Income Research &
Mgmt
University of Massachusetts c/o           200,000     1,892.0        1,892.0            0             -               None
Income Research & Mgmt
Wachovia Securities International      10,000,000    94,602.0       94,602.0            0             -               None
Ltd. (4)
Windmill Master Fund LP                 5,000,000    47,301.0       47,301.0            0             -               None
Xavex Convertible Arbitrage 2 Fund        200,000     1,892.0        1,892.0            0             -               None
Zuger Kulturstiftung Landis & Gyr          90,000       851.4          851.4            0             -               None
Zurich Institutional Benchmark          1,800,000    17,028.4       17,028.4            0             -               None
Management c/o Quattro Fund

Other (6)                              23,090,000   218,436.0      218,436.0





31


(1)  Represents shares of common stock issuable upon conversion of LYONs, at the
     rate of 9.4602 shares of common stock per $1,000 principal amount of
     maturity of LYONs, that would be beneficially owned and offered by the
     selling security holder upon such conversion. This conversion rate is
     subject to adjustment, however, as described under "Description of
     LYONs--Conversion Rights--Conversion Adjustments and Delivery of Common
     Stock." As a result, the number of shares of common stock issuable upon
     conversion of the LYONs may increase or decrease in the future. 3M has the
     right to deliver, in lieu of common stock, cash upon conversion, as
     described in this Prospectus.

(2)  Assumes that all the LYONs and/or all of the common stock into which the
     LYONs are convertible are sold. No selling security holder will own more
     than 1% of the common stock after the offering by the selling stockholder.

(3)  Includes any position, office or other material relationship which the
     selling security holder has had within the past three years with 3M or any
     of its affiliates.

(4)  This selling securityholder has represented to 3M that, although it is
     affiliated with a securities broker or dealer, the selling securityholder
     purchased the securities shown in the ordinary course of business, and at
     the time of the purchase of the securities, the selling securityholder had
     no agreements or understandings, directly or indirectly, with any person to
     distribute the securities.

(5)  This selling securityholder has identified itself as a securities broker or
     dealer, and accordingly it is deemed to be an "underwriter" within the
     meaning of Section 2(a)(11) of the Securities Act.

(6)  Assumes that none of the holders of LYONs who have not yet returned their
     questionnaire beneficially own any other shares of our common stock. Other
     selling securityholders may be identified at a later date and will be
     identified in a post-effective amendment to the registration statement. To
     the extent that they are brokers or dealers, disclosure will be made that
     they are deemed to be "underwriters" within the meaning of Section 2(a)(11)
     of the Securities Act.





32


                              PLAN OF DISTRIBUTION

         The LYONs and the common stock are being registered to permit resale of
these securities by the selling security holders from time to time after the
date of this prospectus. We have agreed, among other things, to bear the
expenses incurred in connection with the registration of the LYONs and the
common stock covered by this prospectus. We will not receive any of the proceeds
from the offering of the LYONs or the common stock by the selling security
holders.

         The selling security holders and their successors, including their
transferees, pledgees or donees or their successors, may sell the LYONs and the
common stock into which the LYONs are convertible directly to purchasers or
through underwriters, broker-dealers or agents, who may receive compensation in
the form of discounts, concessions or commissions from the selling security
holders or the purchasers. These discounts, concessions or commissions as to any
particular underwriter, broker-dealer or agent may be in excess of those
customary in the types of transactions involved.

         The LYONs and the common stock into which the LYONs are convertible may
be sold in one or more transactions at fixed prices, at prevailing market
prices, at prices related to the prevailing market prices, at varying prices
determined at the time of sale, or at negotiated prices. These sales may be
effected in cross, block or other types of transactions:

         *    on any national securities exchange or U.S. inter-dealer system
              of a registered national securities association on which the
              LYONs or the common stock may be listed or quoted at the time of
              sale;
         *    in the over-the-counter market;
         *    in transactions otherwise than on these exchanges or systems or
              in the over-the-counter market;
         *    through the writing of options, whether the options are listed on
              an options exchange or otherwise;
         *    through the settlement of short sales; or
         *    through any other legally available means.

         In no event will such method(s) of distribution take the form of an
underwritten offering of the LYONs or the common stock into which the LYONs are
convertible without our prior written consent. Our common stock is traded on the
New York Stock Exchange under the symbol "MMM."

         In connection with the sale of the LYONs and the common stock into
which the LYONs are convertible, the selling security holders may enter into
hedging transactions with broker-dealers or other financial institutions, which
may in turn engage in short sales of the LYONs or the common stock into which
the LYONs are convertible in the course of hedging the positions they assume.
The selling security holders may also sell the LYONs or the common stock into
which the LYONs are convertible short and deliver these securities to close out
their short positions, or loan or pledge the LYONs or the common stock into
which the LYONs are convertible to broker-dealers that in turn may sell these
securities.

         The aggregate proceeds to the selling security holders from the sale of
the LYONs or common stock into which the LYONs are convertible offered by them
will be the purchase price of the LYONs or common stock less discounts and
commissions, if any. Each of the selling security holders reserves the right to
accept and, together with their agents from time to time, to reject, in whole or
in part, any proposed purchase of LYONs or common stock to be made directly or
through agents. We will not receive any of the proceeds from the sale of the
LYONs or the common stock issuable upon conversion of the LYONs.

         In order to comply with the securities laws of some states, if
applicable, the LYONs and common stock into which the LYONs are convertible may
be sold in these jurisdictions only through registered or licensed brokers or
dealers. In addition, in some states the LYONs and common stock into which the
LYONs are convertible may not be sold unless they have been registered or
qualified for sale or an exemption from registration or qualification
requirements is available and is complied with.

         The selling security holders and any underwriters, broker-dealers or
agents that participate in the sale of the LYONs and common stock into which the
LYONs are convertible may be "underwriters" within the meaning of Section
2(a)(11) of the Securities Act. Any discounts, commissions, concessions or
profit they earn on any resale of the shares may be underwriting discounts and
commissions under the Securities Act. Selling security holders who are
"underwriters" within the meaning of Section 2(a)(11) of the Securities Act will
be subject to the prospectus delivery requirements of the Securities Act. The
selling security holders have acknowledged that they understand their
obligations to comply with the provisions of the Exchange Act and the rules
thereunder relating to stock manipulation, particularly Regulation M.

         In addition, any securities covered by this prospectus that qualify for
sale pursuant to Rule 144 or Rule 144A of the Securities Act may be sold under
Rule 144 or Rule 144A rather than pursuant to this prospectus.

33


         To the extent required, the specific LYONs or common stock to be sold,
the names of the selling security holders, the respective purchase prices and
public offering prices, the names of any agent, dealer or underwriter, and any
applicable commissions or discounts with respect to a particular offer will be
set forth in an accompanying prospectus supplement or, if appropriate, a
post-effective amendment to the registration statement of which this prospectus
is a part.

         We entered into a registration rights agreement for the benefit of
holders of the LYONs to register their LYONs and common stock under applicable
federal and state securities laws under specific circumstances and at specific
times. The registration rights agreement provides for cross-indemnification of
the selling security holders and us and their and our respective directors,
officers and controlling persons against specific liabilities in connection with
the offer and sale of the LYONs and the common stock, including liabilities
under the Securities Act.

                                  LEGAL MATTERS

         Certain legal matters relating to the validity of the LYONs and shares
of common stock issuable upon conversion of the LYONs have been passed upon for
us by Gregg M. Larson, Assistant General Counsel of 3M. Certain matters relating
to United States federal taxation have been passed upon for us by Henry W.
Gjersdal, Jr., Tax Counsel for 3M.

                                     EXPERTS

         The audited financial statements incorporated into this prospectus by
reference to our current report on Form 8-K dated May 23, 2003 have been so
incorporated in reliance on the report of PricewaterhouseCoopers LLP,
independent accountants, given on the authority of that firm as experts in
auditing and accounting.

                            INDEPENDENT ACCOUNTANTS

         With respect to the unaudited interim financial information of 3M
Company for the six-month periods ended June 30, 2003 and 2002 incorporated by
reference in this prospectus, PricewaterhouseCoopers LLP have reported that they
have applied limited procedures in accordance with professional standards for a
review of such information. However, their separate report dated July 21, 2003
and incorporated by reference herein, states that they did not audit and they do
not express an opinion on that unaudited interim financial information.
Accordingly, the degree of reliance on their report on such information should
be restricted in light of the limited nature of the review procedures applied.
PricewaterhouseCoopers LLP is not subject to the liability provisions of Section
11 of the Securities Act of 1933 for their report on the unaudited interim
financial information because that report is not a "report" or a "part" of the
registration statement prepared or certified by PricewaterhouseCoopers LLP
within the meaning of Sections 7 and 11 of the Act.

         WE HAVE NOT AUTHORIZED ANY PERSON TO MAKE A STATEMENT THAT DIFFERS FROM
WHAT IS IN THIS PROSPECTUS. IF ANY PERSON DOES MAKE A STATEMENT THAT DIFFERS
FROM WHAT IS IN THIS PROSPECTUS, YOU SHOULD NOT RELY ON IT. THIS PROSPECTUS IS
NOT AN OFFER TO SELL, NOR IS IT SEEKING AN OFFER TO BUY, THESE SECURITIES IN ANY
STATE IN WHICH THE OFFER OR SALE IS NOT PERMITTED. THE INFORMATION IN THIS
PROSPECTUS IS COMPLETE AND ACCURATE AS OF ITS DATE, BUT THE INFORMATION MAY
CHANGE AFTER THAT DATE.





34


================================================================================


                                  $639,000,000





                                   3M COMPANY





                     LIQUID YIELD OPTION(TM) NOTES DUE 2032
                             (ZERO COUPON -- SENIOR)
               AND SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION
                      OF THE LIQUID YIELD OPTION(TM) NOTES

                   ------------------------------------------




                   ------------------------------------------

                                   PROSPECTUS

                   ------------------------------------------











                               September 23, 2003


================================================================================

35