21st Regiment may refer to:
Infantry regiments
- 21 Regiment Special Air Service, a unit of the British Army
- 21st Foot, a former regiment of the British Army
- 21st Infantry Regiment (Thailand), a unit of the Royal Thai Army
- 21st Infantry Regiment (United States), a unit of the United States Army
- 21st Punjabis, a unit of the British Indian Army
- 21st Marine Infantry Regiment, a unit of the French Marines
- 21st Marine Regiment (United States), a unit of the United States Marine Corps
American Revolutionary War regiments
American Civil War regiments
- 21st Iowa Volunteer Infantry Regiment
- 21st Illinois Volunteer Infantry Regiment
- 21st Maine Volunteer Infantry Regiment
- 21st Michigan Volunteer Infantry Regiment
- 21st Mississippi Infantry Regiment
- 21st Ohio Infantry
- 21st Kansas Militia Infantry Regiment
- 21st Regiment Kentucky Volunteer Infantry
- 21st Regiment Massachusetts Volunteer Infantry
- 21st Wisconsin Volunteer Infantry Regiment
Cavalry regiments
- 21st Lancers, a unit of the British Army
Engineer regiments
- 21st Construction Regiment (Australia), a former unit of the Australian Army's Engineers
- 21 Engineer Regiment (United Kingdom), a unit of the British Army's Royal Engineers
See also
- XXI Corps (disambiguation)
- 21st Brigade (disambiguation)
- 21st Division (disambiguation)
- 21 Squadron (disambiguation)
- Regiment
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