42nd Regiment
42nd Regiment or Forty-second Regiment may refer to:
Confederate States
United Kingdom
- 42nd Deoli Regiment, an infantry regiment of the British Indian Army
- 42 Engineer Regiment (Geographic), a unit of the British Army Royal Engineers
- 42nd Regiment of Foot, a unit of the British Army up to 1881, known as the "Black Watch"
- 42nd Royal Tank Regiment, a World War II armoured unit of the British Army
United States
- 42nd Illinois Volunteer Infantry Regiment
- 42nd Indiana Infantry Regiment
- 42nd Infantry Regiment (United States), a unit of the US Army
- 42nd Kentucky Infantry Regiment
- 42nd New York Volunteer Infantry Regiment
- 42nd Ohio Infantry Regiment
- 42nd United States Colored Infantry Regiment
- 42nd Wisconsin Volunteer Infantry Regiment
Other nations
- 42nd Armoured Regiment (India), a unit of the Union of the Indian Army
- 42nd Bomber Aviation Regiment, an aviation unit of the Yugoslav Air Force
- 42nd Field Artillery Regiment (Lanark and Renfrew Scottish), RCA, a unit of the Canadian Army
- 42nd Infantry Regiment (France), a former unit in the French Army
- 42nd Infantry Regiment (Poland), a unit of the Polish Armed Forces of the Second Polish Republic