20th Brigade
- 20 Squadron (disambiguation)
- 20th Armoured Infantry Brigade (United Kingdom)
- 20th Army (disambiguation)
- 20th Battalion (disambiguation)
- 20th Brigade (Australia)
- 20th Brigade (United Kingdom)
- 20th Division (disambiguation)
- 20th Engineer Brigade (United States)
- 20th Independent Infantry Brigade (Guards)
- 20th Indian Brigade
- 20th Indian Infantry Brigade
- 20th Mounted Brigade
- 20th Regiment (disambiguation)
- XX Brigade, Royal Horse Artillery (T.F.)
- XX Corps (disambiguation)