6 Corps, 6th Corps, Sixth Corps, or VI Corps may refer to:

• VI Cavalry Corps (Grande Armée), a cavalry formation of the Imperial French army during the Napoleonic Wars
• VI Corps (Grande Armée), a formation of the Imperial French army during the Napoleonic Wars

• VI Cavalry Corps (German Empire), a formation of the Imperial German Army during World War I
• VI Corps (German Empire), a formation of the Imperial German Army prior to and during World War I
• VI Reserve Corps (German Empire), a formation of the Imperial German Army during World War I
• VI Army Corps (Wehrmacht), World War II

• VI Corps (United States)
• VI Corps (Union Army), a formation of the Union (North) during the American Civil War
• Sixth Army Corps (Spanish–American War)

• VI Corps (Ottoman Empire)
• VI Corps (North Korea)
• VI Corps (United Kingdom) a formation of the British Army during World War I
• VI Corps, part of Ground Operations Command, South Korea
• IV Corps (Pakistan), a field corps of the Pakistan Army
• 6th Corps (Army of the Republic of Bosnia and Herzegovina)

• List of military corps by number