40th Battalion

40th Battalion may refer to:

• 40th Battalion (Australia), an infantry battalion 1916–1987
• 40th Battalion (Nova Scotia), CEF, a Canadian infantry battalion during World War I
• Sparrow Force (2/40th Australian Infantry Battalion), a unit of the Australian Army
• 40 Commando, a unit of the United Kingdom Royal Marine Corps

• 40th Division (disambiguation)
• 40th Brigade (disambiguation)
• 40th Regiment (disambiguation)
• 40th Squadron (disambiguation)