In military terms, 4th Division may refer to:
Infantry divisions
- 4th (Quetta) Division, British Indian Army
- 4th Alpine Division Cuneense, Italy
- 4th Blackshirt Division (3 January), Italy
- 4th Canadian Division
- 4th Division (Australia)
- 4th Division (Estonia)
- 4th Division (German Empire)
- 4th Division (Imperial Japanese Army)
- 4th Division (Iraq)
- 4th Division (Japan)
- 4th Division (New Zealand)
- 4th Division (North Korea)
- 4th Division (Norway), participated in the Norwegian Campaign
- 4th Division (Reichswehr)
- 4th Guards Motor Rifle Division (Soviet Union)
- 4th Guards Rifle Division (Soviet Union)
- 4th Infantry Division (Belgium), Belgian Army order of battle (1914)
- 4th Infantry Division (Greece)
- 4th Infantry Division (India)
- 4th Infantry Division (Philippines)
- 4th Infantry Division (Poland)
- 4th Infantry Division (Romania)
- 4th Infantry Division (Russian Empire)
- 4th Infantry Division (Thailand)
- 4th Infantry Division (United Kingdom)
- 4th Infantry Division (United States)
- 4th Infantry Division (Wehrmacht)
- 4th Infantry Division Littorio, Italy
- 4th Infantry Division Livorno
- 4th Luftwaffe Field Division (Germany)
- 4th Marine Division (United States)
- 4th Motor Rifle Division (Soviet Union)
- 4th Motorized Infantry Division (People's Republic of China)
- 4th Mountain Division (Wehrmacht)
- 4th Panzergrenadier Division (Bundeswehr)
- 4th Rifle Division (Soviet Union)
- 4th Royal Bavarian Division
- 4th SS Polizei Panzergrenadier Division, Germany
- Finnish 4th Division (Winter War)
Cavalry divisions
- 4th Light Cavalry Division (France)
- 4th Cavalry Division (German Empire)
- 9th Panzer Division (Wehrmacht), originally the 4th Light Division
- 1st Indian Cavalry Division, designated 4th Cavalry Division from November 1916 to March 1918 in France in World War I
- 4th Cavalry Division (India), British Indian Army
- 4th Cavalry Division (Russian Empire)
- 4th Mounted Division, United Kingdom
Armoured divisions
- 4th Canadian Division
- 4th Armoured Division (Egypt)
- 4th Armoured Division (France, 1964)
- 4th Armored Division (France, 1940)
- 4th Panzer Division (Wehrmacht)
- 4th Tank Division (Imperial Japanese Army)
- 4th Guards Tank Division, Russia
- 4th Armoured Division (Syria)
- 4th Infantry Division (United Kingdom) - an armoured division in the 1980s
- 4th Armored Division (United States)
Aviation divisions
- 4th Fighter Aviation Division (People's Liberation Army Air Force), China
- 4th Air Division (Germany)
- 4th Fighter Division (Germany)
- 4th Air Division, United States
Other divisions
- 4th Parachute Division (Germany)
- 4th Guards Airborne Division (Soviet Union)
- 4th Anti-Aircraft Artillery Division (Soviet Union)
- 4th Guards Anti-Aircraft Artillery Division (Soviet Union)
- 4th Army Division, Sweden
- 4th Airborne Division, United Kingdom deception formation
- 4th Anti-Aircraft Division (United Kingdom)