27 Corps, 27th Corps, Twenty Seventh Corps, or XXVII Corps may refer to:
- XXVII Reserve Corps (German Empire), a unit during World War I
- XXVII Army Corps (Wehrmacht), a German unit during World War II
- 27th Army Corps (Russian Empire), a Russian unit during World War I
- 27th Mechanized Corps (Soviet Union), a Soviet unit during World War II
- 27th Air Defense Corps, a Soviet Cold War era unit
See also
- List of military corps by number
- 27th Army (disambiguation)
- 27th Battalion (disambiguation)
- 27th Brigade (disambiguation)
- 27th Division (disambiguation)
- 27th Regiment (disambiguation)
- 27 Squadron (disambiguation)
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