12th Division
- 12 Squadron (disambiguation)
- 12th (Eastern) Division
- 12th (Eastern) Infantry Division
- 12th Air Division (United States)
- 12th Amurskaya Rifle Division
- 12th Armored Division (United States)
- 12th Brigade (disambiguation)
- 12th Division (Australia)
- 12th Division (Imperial Japanese Army)
- 12th Division (North Korea)
- 12th Division (United States)
- 12th Indian Division
- 12th Infantry Division (Germany)
- 12th Infantry Division (India)
- 12th Infantry Division (Pakistan)
- 12th Infantry Division (Poland)
- 12th Infantry Division (South Korea)
- 12th Infantry Division Sassari
- 12th Mechanized Infantry Division (Greece)
- 12th Regiment (disambiguation)
- 12th Reserve Division (German Empire)
- 12th SS Panzer Division Hitlerjugend (Germany)
- 12th Wing (disambiguation)
- British Indian Army
- Philippine Division (United States)
- Twelfth Army (disambiguation)
- XII Corps (disambiguation)