53rd Regiment or 53rd Infantry Regiment may refer to:
53rd (Napier's) Regiment of Foot, a unit of the British Army 53rd (Shropshire) Regiment of Foot, a unit of the British Army 53rd Sikhs (Frontier Force), a unit of the British Indian Army 53rd (City of London) Heavy Anti-Aircraft Regiment, Royal Artillery 53rd Anti-Aircraft Missile Regiment (Romania) 53rd Coast Artillery Regiment, a unit of the United States Army 53rd Infantry Regiment (Imperial Japanese Army) 53rd Infantry Regiment (United States) 53rd Coast Artillery Regiment, United States
American Civil War regiments 53rd Alabama Cavalry Regiment, a unit of the Confederate States Army Union Army 53rd Illinois Infantry Regiment 53rd Indiana Infantry Regiment 53rd Kentucky Mounted Infantry Regiment 53rd Massachusetts Infantry Regiment 53rd Ohio Infantry Regiment 53rd Pennsylvania Infantry Regiment 53rd Wisconsin Infantry Regiment
See also 53rd Division (disambiguation)