11th Battalion may refer to:
- 11th Battalion (Australia), a unit of the Australian Army
- 2/11th Australian Infantry Battalion, a unit of the Australian Army
- 11th/28th Battalion, Royal Western Australia Regiment, a unit of the Australian Army
- 11th Philippine Scout Battalion, a unit of the Philippine Army
- 11th Battalion Ulster Defence Regiment, a unit of the British Army
- Czechoslovak 11th Infantry Battalion, a unit of the Czechoslovak army in exile during World War II