15th Division
- 15th (Scottish) Division
- 15th (Scottish) Infantry Division
- 15th Air Defense Division
- 15th Cavalry Division (Russian Empire)
- 15th Cavalry Division (United States)
- 15th Division (German Empire)
- 15th Division (Imperial Japanese Army)
- 15th Division (North Korea)
- 15th Fighter Aviation Division (People's Liberation Army Air Force)
- 15th Infantry Division (Belgium)
- 15th Infantry Division (France)
- 15th Infantry Division (Greece)
- 15th Infantry Division (India)
- 15th Infantry Division (Iraq)
- 15th Infantry Division (Philippines)
- 15th Infantry Division (Poland)
- 15th Infantry Division (South Korea)
- 15th Infantry Division (Thailand)
- 15th Infantry Division (United States)
- 15th Infantry Division (Wehrmacht)
- 15th Infantry Division Bergamo
- 15th Landwehr Division (German Empire)
- 15th Motorized Infantry Division (France)
- 15th Panzer Division (Wehrmacht)
- 15th Panzergrenadier Division (Wehrmacht)
- 15th Reserve Division (German Empire)
- 15th Rifle Division (Soviet Union)
- 15th Special Forces Division
- 15th Waffen Grenadier Division of the SS (1st Latvian)