Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in Registration StatementNo. 333-227514 on FormS-3, Registration Statement Nos.333-168320 and333-178991 on FormS-4 and Registration Statement Nos.333-55773,333-103344,333-106584,333-145928,333-145930,333-174788,333-184999,333-199759 and333-1235296 on FormS-8 of Aon PLC of our report dated February 26, 2020, relating to the financial statements of Willis Towers Watson PLC appearing in this Current Report on Form8-K dated May 12, 2020.
/s/ DELOITTE & TOUCHE LLP
Philadelphia, PA
May 12, 2020
