9th Division
- 9th (Highland) Infantry Division
- 9th (Scottish) Division
- 9th (Secunderabad) Division
- 9th Armored Division (United States)
- 9th Armoured Division (Greece)
- 9th Armoured Division (Syria)
- 9th Armoured Division (United Kingdom)
- 9th Bavarian Reserve Division
- 9th Cavalry Division (German Empire)
- 9th Division (Australia)
- 9th Division (German Empire)
- 9th Division (Imperial Japanese Army)
- 9th Division (Iraq)
- 9th Division (Japan)
- 9th Division (North Korea)
- 9th Division (People's Republic of China)
- 9th Division (Singapore)
- 9th Division (South Africa)
- 9th Division (South Vietnam)
- 9th Division (Vietnam)
- 9th Infantry Division (Bangladesh)
- 9th Infantry Division (Greece)
- 9th Infantry Division (India)
- 9th Infantry Division (Ottoman Empire)
- 9th Infantry Division (Philippines)
- 9th Infantry Division (South Korea)
- 9th Infantry Division (Soviet Union)
- 9th Infantry Division (Thailand)
- 9th Infantry Division (United States)
- 9th Infantry Division (Wehrmacht)
- 9th Landwehr Division
- 9th Luftwaffe Field Division (Germany)
- 9th Motorised Division Pasubio
- 9th Motorized Division (France)
- 9th Mountain Division (Wehrmacht)
- 9th Panzer Division (Wehrmacht)
- 9th Parachute Division (Germany)
- 9th Reserve Division (German Empire)
- 9th SS Panzer Division Hohenstaufen
- 9th Space Division
- 9th Tank Division (People's Republic of China)
- 9th Tank Division (Soviet Union)
- Division No. 9 (disambiguation)