40th Division or 40th Infantry Division may refer to:

Infantry Divisions

• 40th Division (German Empire), a unit of the Imperial German Army
• 40th Division (Imperial Japanese Army), a unit of the Imperial Japanese Army
• 40th Division (United Kingdom), a unit of the United Kingdom Army
• 40th Infantry Division (United States), a unit of the California Army National Guard in the U.S. Army.
• 40th Infantry Division (People's Republic of China), a unit of the PLA
• 40th Rifle Division
• 40th Infantry Division Cacciatori d'Africa, Italian division of World War II

Aviation Divisions

• 40th Air Division, a unit of the United States Air Force

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

This disambiguation page lists articles about military units and formations which are associated with the same title.
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