42nd Regiment, 42nd Infantry Regiment or 42nd Armoured Regiment may refer to: United Kingdom 42nd Regiment of Foot, a unit of the British Army up to 1881, known as the "Black Watch" 42 Engineer Regiment (Geographic), a unit of the British Army Royal Engineers 42nd Royal Tank Regiment, a World War II armoured unit of the British Army 42nd Deoli Regiment, an infantry regiment of the British Indian Army United States 42nd Infantry Regiment (United States), a unit of the US Army American Civil War regiments Union (northern) Army 42nd Illinois Volunteer Infantry Regiment 42nd Indiana Infantry Regiment 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 Confederate (southern) Army 42nd Arkansas Cavalry Regiment 42nd Mississippi Infantry Regiment 42nd Virginia 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 See also 42nd Division (disambiguation) 42nd Group (disambiguation) 42nd Brigade (disambiguation) 42nd Battalion (disambiguation) 42 Squadron (disambiguation)