21 Corps, 21st Corps, Twenty First Corps, or XXI Corps may refer to:
- XXI Corps (German Empire), a unit of the Imperial German Army prior to and during World War I
- XXI Corps (Ottoman Empire), active during World War I
- XXI Corps (United Kingdom), active during World War I
- Indian XXI Corps, active during World War II
- XXI Corps (India), currently active Indian Army corps
- XXI Corps (United States), active during World War II
- XXI Corps (Union Army), active during the American Civil War
- XXI Mountain Corps (Wehrmacht), active during World War II
See also
- List of military corps by number
- 21st Army (disambiguation)
- 21st Brigade (disambiguation)
- 21st Division (disambiguation)
- 21st Regiment (disambiguation)
- 21 Squadron (disambiguation)
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