FORM 3
        	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES
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                      	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	                      	

1. Name and Address of Reporting Person *

Slyfield Jillian	2. Date of Event Requiring Statement (MM/DD/YYYY)
12/1/2021 
	3. Issuer Name and Ticker or Trading Symbol

Aon plc [AON]	
(Last)       (First)       (Middle)

200 E. RANDOLPH ST.	4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                          _____ 10% Owner
___X___ Officer (give title below)        _____ Other (specify below)
Chief Innovation Officer /	
(Street)

CHICAGO, IL 60601      

(City)             (State)             (Zip)	5. If Amendment, Date Original Filed(MM/DD/YYYY)
 
	6. Individual or Joint/Group Filing(Check Applicable Line)

_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person	

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 Stock 	304.492 	D 	 	

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)	
1. Title of Derivate Security
(Instr. 4)	2. Date Exercisable and Expiration Date
(MM/DD/YYYY)	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)	3/15/2022 	Class A Ordinary Shares 	141 	 (2)	D 	 	
Employee Stock Option (Right to Buy) 	9/24/2021 (3)	9/23/2028 	Class A Ordinary Shares 	20 	$299.17 	D 	 	
Restricted Share Unit (Right to Receive) 	 (4)	5/21/2023 	Class A Ordinary Shares 	210 	 (2)	D 	 	
Restricted Share Unit (Right to Receive) 	 (5)	2/22/2024 	Class A Ordinary Shares 	696 	 (2)	D 	 	
Restricted Share Unit (Right to Receive) 	 (6)	3/13/2023 	Class A Ordinary Shares 	231 	 (2)	D 	 	
Restricted Share Unit (Right to Receive) 	 (7)	5/21/2025 	Class A Ordinary Shares 	207 	 (2)	D 	 	
Restricted Share Unit (Right to Receive) 	 (8)	3/15/2024 	Class A Ordinary Shares 	327 	 (2)	D 	 	
Restricted Share Unit (Right to Receive) 	 (9)	5/21/2026 	Class A Ordinary Shares 	197 	 (2)	D 	 	
Restricted Share Unit (Right to Receive) 	 (10)	9/17/2024 	Class A Ordinary Shares 	277 	 (2)	D 	 	

Explanation of Responses:	
(1) 	A restricted share unit award was granted on March 15, 2019 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.	
(2) 	The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of US$0.01 per share issued to the reporting person.	
(3) 	The options became exercisable on the grant date. All options are exercisable.	
(4) 	A restricted share unit award was granted on May 21, 2018 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 20% of the award vests on each of the first through fifth anniversary of the date of grant.	
(5) 	A restricted share unit award was granted on February 22, 2019 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 20% of the award vests on each of the first through fifth anniversary of the date of grant.	
(6) 	A restricted share unit award was granted on March 13, 2020 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.	
(7) 	A restricted share unit award was granted on May 21, 2020 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 20% of the award vests on each of the first through fifth anniversary of the date of grant.	
(8) 	A restricted share unit award was granted on March 15, 2021 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.	
(9) 	A restricted share unit award was granted on May 21, 2021 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 20% of the award vests on each of the first through fifth anniversary of the date of grant.	
(10) 	A restricted share unit award was granted on September 17, 2021 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan: 33 1/3% of the award vests on each of the first through third anniversary of the date of grant.	

Reporting Owners	
Reporting Owner Name / Address	Relationships	
	Director	10% Owner	Officer	Other	
Slyfield Jillian
200 E. RANDOLPH ST.
CHICAGO, IL 60601			Chief Innovation Officer		

Signatures		
/s/ Julie Cho - Julie Cho pursuant to a power of attorney from Jillian Slyfield		12/10/2021	
**Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
*	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).	
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.	

POWER OF ATTORNEY
I, Jillian Slyfield ("Grantor"), hereby confirm, constitute and appoint Darren Zeidel, Julie Cho, Colby Alexis and Matthew Cavanaugh, or any of them signing singly, and with full power of substitution, as the true and lawful attorney-in-fact of Grantor to:
1. prepare, execute in Grantor's name and on Grantor's behalf, and submit to the United States Securities and Exchange Commission (the "SEC") a Form ID, including amendments thereto, and any other documents necessary or appropriate to obtain codes and passwords enabling the undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the Securities Exchange Act of 1934, as amended (the "Exchange Act") or any rule or regulation promulgated by the SEC;
2. execute for and on behalf of Grantor, in Grantor's capacity as an officer, director or greater than ten percent shareholder of Aon plc (the "Company"), Forms 3, 4 and 5, including but not limited to any amendments thereto, in accordance with Section 16(a) of the Exchange Act, and the rules promulgated thereunder, which may be necessary or desirable as a result of Grantor's ownership of or transaction in securities of the Company; and
3. do and perform any and all acts for and on behalf of Grantor which may be necessary or desirable to complete and execute any such Form 3, 4 or 5 or any amendments thereto, and timely file such form with the SEC and any other stock exchange or similar authority.
Grantor hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. Grantor acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of Grantor, are not assuming, nor is the Company assuming, any of Grantor's responsibilities to comply with Section 16 of the Exchange Act.
This Power of Attorney shall be effective on the date set forth below and shall continue in full force and effect until the date on which Grantor shall cease to be subject to Section 16 of the Exchange Act and the rules promulgated thereunder or until such earlier date on which written notification executed by Grantor is filed with the SEC expressly revoking this Power of Attorney.
IN WITNESS WHEREOF, Grantor has caused this Power of Attorney to be executed as of this 1st day of December, 2021.

Signature:  /s/ Jillian Slyfield

Name:         Jillian Slyfield