III Corps

3rd Corps, Third Corps, III Corps, or 3rd Army Corps may refer to:

France

 * 3rd Army Corps (France)
 * III Cavalry Corps (Grande Armée), a cavalry unit of the Imperial French Army during the Napoleonic Wars
 * III Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars

Germany

 * III Cavalry Corps (German Empire), a unit of the Imperial German Army
 * III Corps (German Empire), a unit of the Imperial German Army
 * III Reserve Corps (German Empire), a unit of the Imperial German Army
 * III Royal Bavarian Corps, a unit of the Bavarian Army and the Imperial German Army
 * III Army Corps (Wehrmacht), a unit in World War II
 * III Corps (Bundeswehr)
 * III Panzer Corps (Germany)
 * III (Germanic) SS Panzer Corps

Russia and Soviet Union

 * 3rd Army Corps (Russian Empire), a unit in World War I
 * 3rd Mechanized Corps (Soviet Union)
 * 3rd Rifle Corps, Soviet Union
 * 3rd Army Corps (Russia), Russian Federation

United States

 * III Corps (United States)
 * III Corps (Union Army)
 * Third Army Corps (Spanish–American War)
 * Third Corps, Army of Northern Virginia
 * Third Corps, Army of Tennessee

Others

 * III Corps (Australia)
 * Finnish III Corps (Winter War)
 * Finnish III Corps (Continuation War)
 * III Army Corps (Greece)
 * III Corps (India)
 * 3rd Army Corps (Italy)
 * III Corps (North Korea)
 * III Corps (Ottoman Empire)
 * III Corps (South Korea)
 * III Corps (South Vietnam)
 * 3rd Corps (Syria)
 * 3rd Corps (Turkey)
 * III Corps (United Kingdom)
 * 3rd Corps (Vietnam People's Army)
 * 3rd Army Corps (Azerbaijan)
 * 3rd Army Corps (Armenia)