43rd Regiment or 43rd Infantry Regiment may refer to:
43rd Erinpura Regiment, a unit of the British Indian Army 43rd Infantry Regiment (France), a unit of the French Army 43rd Infantry Regiment (Philippine Commonwealth Army), a unit of the Philippine Commonwealth Army 43rd (Monmouthshire) Regiment of Foot, a unit of the United Kingdom Army 43rd Royal Tank Regiment, a armoured unit of the United Kingdom Army 43rd Infantry Regiment (United States), a unit of the United States Army 43rd Air Defense Artillery Regiment, a unit of the United States Army 43rd Bomber Aviation Regiment, an aviation unit of the Yugoslav Air Force
American Civil War regiments 43rd Illinois Volunteer Infantry Regiment, a unit of the Union (North) Army 43rd Wisconsin Volunteer Infantry Regiment, a unit of the Union (North) Army 43rd New York Volunteer Infantry Regiment, a unit of the Union (North) Army 43rd Regiment Massachusetts Volunteer Infantry, a unit of the Union (North) Army 43rd Indiana Infantry Regiment, a unit of the Union (North) Army 43rd Ohio Infantry, a unit of the Union (North) Army 43rd United States Colored Infantry, a unit of the Union (North) Army 43rd Georgia Volunteer Infantry, a unit of the Confederate Army 43rd North Carolina Infantry, a unit of the Confederate Army 43rd Mississippi Infantry, a unit of the Confederate Army
See also 43rd Division (disambiguation) 43rd Group (disambiguation) 43rd Brigade (disambiguation) 43rd Battalion (disambiguation) 43rd Squadron (disambiguation)