| Garrison sergeant major | |
|---|---|
 Garrison Sergeant Major London District's badge of rank | |
| Country |  United Kingdom |
| Service branch |  British Army |
| Abbreviation | GSM |
| Rank group | Warrant officer |
| NATO rank code | OR-9 |
| Formation | 1940 |
A garrison sergeant major (GSM)[a] in the British Army is the senior warrant officer of a garrison and holds the rank of warrant officer class 1. The GSM London District, always a guardsman, holds one of the four most senior WO1 appointments in the British Army, and has military ceremonial responsibility for important state occasions such as Trooping the Colour.
- ^ "No. 48587". The London Gazette (Supplement). 16 April 1981. p. 5671. "No. 25044". The London Gazette. 2 December 1881. p. 6467.
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