FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person *   Grace Caroline 2. Date of Event Requiring Statement (Month/Day/Year) 05/01/2017 3. Issuer Name and Ticker or Trading Symbol Aon plc [AON] (Last) (First) (Middle) 200 EAST RANDOLPH ST. 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) CEO, Global Retirement & Inves 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) CHICAGO, IL 60601 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Class A Ordinary Shares 43,847 D Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Share Unit (Right to Receive)	  (1)	05/21/2017	Class A Ordinary Shares	1,296	$ (2)	D	Â
Restricted Share Units (Right to Receive)	  (3)	05/21/2018	Class A Ordinary Shares	1,510	$ (2)	D	Â
Restricted Share Unit (Right to Receive)	  (4)	02/19/2018	Class A Ordinary Shares	605	$ (2)	D	Â
Restricted Share Unit (Right to Receive)	  (5)	11/20/2020	Class A Ordinary Shares	2,108	$ (2)	D	Â
Restricted Share Unit (Right to Receive)	  (6)	02/18/2019	Class A Ordinary Shares	1,481	$ (2)	D	Â
Restricted Share Unit (Right to Receive)	  (7)	02/16/2020	Class A Ordinary Shares	1,612	$ (2)	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Grace Caroline 200 EAST RANDOLPH ST. CHICAGO, IL 60601	Â	Â	  CEO, Global Retirement & Inves	Â

Signatures

/s/ Molly Johnson, pursuant to a Power of Attorney from Caroline Grace		05/11/2017
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	A restricted share unit award was granted on May 21, 2012 and vests in accordance with the terms of the Aon Stock Incentive Plan as follows: 20% of the award vests on each of the first through five anniversaries of the date of the grant.
(2)	The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with UK law, the reporting person agreed to pay the issuer the nominal value of US$0.01 per share issued to the reporting person.
(3)	A restricted share unit award was granted on May 21, 2013 and vests in accordance with the terms of the Aon Stock Incentive Plan as follows: 20% of the award vests on each of the first through five anniversaries of the date of the grant.
(4)	A restricted share unit award was granted on February 19, 2015 and vests in accordance with the terms of the Aon Stock Incentive Plan as follows: 33 1/3% of the award vests on each of the first through third anniversaries of the date of the grant.
(5)	A restricted share unit award was granted on November 20, 2015 and vests in accordance with the terms of the Aon Stock Incentive Plan as follows: 20% of the award vests on each of the first through five anniversaries of the date of the grant.
(6)	A restricted share unit award was granted on February 18, 2016 and vests in accordance with the terms of the Aon Stock Incentive Plan as follows: 33 1/3% of the award vests on each of the first through third anniversaries of the date of the grant.
(7)	A restricted share unit award was granted on February 16, 2017 and vests in accordance with the terms of the Aon Stock Incentive Plan as follows: 33 1/3% of the award vests on each of the first through third anniversaries of the date of the grant.

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