21st Brigade
In military terms, 21st Brigade may refer to:
Australia
Germany
Greece
- 21st Armoured Brigade (Greece)
- 21st Brigade (Greece), an infantry brigade
India
Indonesia
Japan
Namibia
Poland
Russia
Soviet Union
Ukraine
United Kingdom
- 21st Army Tank Brigade (United Kingdom)
- 21st Brigade (United Kingdom)
- 21st (East Africa) Infantry Brigade
- 21st Mounted Brigade
- 21st Reserve Brigade
- 21st Brigade, Royal Field Artillery