- Source: 91st Brigade
- Divisi ke-91 (Angkatan Darat Kekaisaran Jepang)
- Daftar divisi Amerika Serikat selama Perang Dunia II
- 91st Brigade
- 1st Armoured Division (Syria)
- 91st Division (United States)
- 91st Brigade (United Kingdom)
- 5th Armored Brigade (United States)
- 1st Cavalry Division (United States)
- 91st Mixed Brigade
- List of pals battalions
- 7th Infantry Division (United Kingdom)
- 91st Cavalry Regiment
In military terms, 91st Brigade may refer to:
91st Mixed Brigade (Spain)
91st Brigade (United Kingdom)
91st Engineer Brigade (Soviet Union)