11th Battalion
- 11 Squadron (disambiguation)
- 11th Army (disambiguation)
- 11th Battalion (Australia)
- 11th Battalion Ulster Defence Regiment
- 11th Brigade (disambiguation)
- 11th Division (disambiguation)
- 11th Group (disambiguation)
- 11th Philippine Scout Battalion
- 11th Regiment (disambiguation)
- 11th Separate Motorized Infantry Battalion (Ukraine)
- 11th/28th Battalion, Royal Western Australia Regiment
- 2/11th Australian Infantry Battalion
- Czechoslovak 11th Infantry Battalion
- XI Corps (disambiguation)