8 Corps, 8th Corps, Eighth Corps, or VIII Corps may refer to:
- VIII Corps (Grande Armée), a corps of the Imperial French army during the Napoleonic Wars
- VIII Corps (German Empire), a formation of the Imperial German Army prior to and during World War I
- VIII Reserve Corps (German Empire), a formation of the Imperial German Army during World War I
- VIII Corps (Ottoman Empire)
- 8th Cavalry Corps (Soviet Union)
- 8th Estonian Rifle Corps of the Red Army
- 8th Army Corps (Ukraine)
- VIII Corps (United Kingdom)
- VIII Corps (United States), a formation of the U.S. Army in World War I and World War II
- VIII Corps (Union Army), a formation of the American Civil War
- Eighth Army Corps (Spanish–American War), a U.S. Army formation of the Spanish–American and Philippine–American wars
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