In military terms, 109th Division or 109th Infantry Division may refer to:
109th Division (People's Republic of China) 109th Infantry Division (German Empire) 109th Division (Imperial Japanese Army) 109th Guards Rifle Division, Soviet Union 109th Motorized Division, Soviet Union 109th Rifle Division, Soviet Union
See also List of military divisions by number 109th Brigade (disambiguation) 109th Regiment (disambiguation) 109th Squadron (disambiguation) 109th (disambiguation)