Simon Byrne, QPM (born 29 April 1963) is an English former senior police officer.

He served as Chief Constable of the Police Service of Northern Ireland (PSNI) from July 2019 until he resigned in September 2023.

He later studied police management at the University of Manchester, graduating with a Master of Arts (MA) degree.

[13][14] On 24 May 2019, Byrne was announced as the next Chief Constable of the Police Service of Northern Ireland (PSNI).

[15] At a meeting of the Northern Ireland Policing Board on 6 April 2023, his contract as chief constable was extended by three years allowing his to continue in that role until 1 July 2027.

[18] Following an emergency meeting of the Northern Ireland Policing Board on 4 September 2023, Byrne resigned as Chief Constable.