Nóirín O'Sullivan (born 3 November 1960) is an Irish Garda who has served as Director of Strategic Partnerships for Europe at the International Association of Chiefs of Police since October 2017.
She previously served as Garda Commissioner from 2014 to 2017.
In October 2018, Nóirín was appointed UN Assistant Secretary-General for the Department of Safety and Security.
The first woman to lead the Gardaí in its 92-year history, O'Sullivan announced her retirement on 10 September 2017.In late October 2017 she was appointed Director of Strategic Partnerships for Europe at the International Association of Chiefs of Police.
In October 2018, Nóirín was appointed by Secretary-General of the UN as UN Assistant Secretary-General for Safety and Security.