42nd Regiment

42nd Regiment, 42nd Infantry Regiment or 42nd Armoured Regiment may refer to:


 * Infantry regiments :
 * 42nd Deoli Regiment, an infantry regiment of the British Indian Army
 * 42nd Infantry Regiment (Philippine Commonwealth Army), a unit of the Philippine Commonwealth Army
 * 42nd Regiment of Foot, a unit of the British Army up to 1881 known as the "Black Watch"


 * Armoured regiments :
 * 42 Armoured Regiment (India), a unit of the Union of India Army
 * 42nd Royal Tank Regiment, a WWII armoured unit of the British Army


 * Bomber regiments :
 * 42nd Bomber Aviation Regiment, a aviation unit of the Yugoslav Air Force


 * American Civil War regiments :
 * 42nd Illinois Volunteer Infantry Regiment, a unit of the Union (Northern) Army during the American Civil War
 * 42nd Regiment Indiana Infantry, a unit of the Union (Northern) Army during the American Civil War
 * 42nd New York Volunteer Infantry Regiment, a unit of the Union (Northern) Army during the American Civil War
 * 42nd Virginia Infantry, an infantry regiment of the Confederate (Southern) Army during the American Civil War
 * 42nd Battalion Virginia Cavalry, a cavalary regiment of the Confederate (Southern) Army during the American Civil War
 * 42nd Wisconsin Volunteer Infantry Regiment, a unit of the Union (Northern) Army during the American Civil War