3rd Division
- 3d Air Division
- 3d Attack Wing
- 3rd (Lahore) Division
- 3rd Algerian Infantry Division
- 3rd Alpine Division Julia
- 3rd Armored Division (France)
- 3rd Armored Division (Jordan)
- 3rd Armored Division (United States)
- 3rd Armoured Division (Australia)
- 3rd Armoured Division (Syria)
- 3rd Blackshirt Division (21 April)
- 3rd Canadian Division
- 3rd Carpathian Rifle Division (Poland)
- 3rd Cavalry Division (German Empire)
- 3rd Cavalry Division (Reichswehr)
- 3rd Cavalry Division (United Kingdom)
- 3rd Cavalry Division (United States)
- 3rd Cavalry Division Amedeo Duca d'Aosta
- 3rd Colonial Infantry Division (France)
- 3rd Division (Australia)
- 3rd Division (Colombia)
- 3rd Division (Estonia)
- 3rd Division (German Empire)
- 3rd Division (Imperial Japanese Army)
- 3rd Division (Iraq)
- 3rd Division (Japan)
- 3rd Division (New Zealand)
- 3rd Division (Nigeria)
- 3rd Division (North Korea)
- 3rd Division (Norway)
- 3rd Division (Reichswehr)
- 3rd Division (Singapore)
- 3rd Division (South Sudan)
- 3rd Division (South Vietnam)
- 3rd Division (United Kingdom)
- 3rd Division (Vietnam)
- 3rd Flak Division
- 3rd Guards Division (Imperial Japanese Army)
- 3rd Guards Motor Rifle Division
- 3rd Infantry Division (Greece)
- 3rd Infantry Division (Philippines)
- 3rd Infantry Division (South Africa)
- 3rd Infantry Division (South Korea)
- 3rd Infantry Division (United States)
- 3rd Infantry Division (Wehrmacht)
- 3rd Lahore Divisional Area
- 3rd Legions Infantry Division (Poland)
- 3rd Light Division (Wehrmacht)
- 3rd Light Mechanized Division (France)
- 3rd Marine Division (United States)
- 3rd Motor Rifle Division
- 3rd Mountain Infantry Division Ravenna
- 3rd Mounted Division
- 3rd Panzer Division (Bundeswehr)
- 3rd Panzer Division (Wehrmacht)
- 3rd Rifle Division (Soviet Union)
- 3rd SS Panzer Division Totenkopf
- 3rd Special Forces Division (Greece)
- 3rd Tank Division (Imperial Japanese Army)
- 3rd Tank Division (Soviet Union)
- Chindits
- Finnish 3rd Division (Continuation War)
- Finnish 3rd Division (Winter War)
- Third Division (disambiguation)