A Garrison Sergeant Major (GSM) in the British Army is the senior non-commissioned officer of a garrison and holds the rank of Warrant Officer Class 1. The GSM London District, always a guardsman, holds the third most senior NCO appointment in the British Army and is responsible for the drill on important state occasions such as Trooping the Colour.

Garrison Sergeant Majors, London District

• • 1940-1950 WO1 (GSM) Thomas Courtney, Coldstream Guards
  • 1950-1951 WO1 (GSM) George Howe, Irish Guards
  • 1951-1952 WO1 (GSM) Frederick Thomas Aylen, Coldstream Guards
  • 1952-1965 WO1 (GSM) George Stone MBE RVM, Irish Guards
  • 1965-1977 WO1 (GSM) Tom Taylor, Grenadier Guards
  • 1977-1987 WO1 (GSM) Alex Dumon MBE, Coldstream Guards
  • 1987-2002 WO1 (GSM) Alan G 'Perry' Mason MVO MBE, Coldstream Guards
  • 2002-        WO1 (GSM) Bill Mott, Welsh Guards