33rd Regiment

33rd Regiment or 33rd Infantry Regiment may refer to:


 * 33 Combat Engineer Regiment, a unit of the Canadian Army
 * 33rd Regiment of Foot, a unit of the United Kingdom Army
 * 33 (Lancashire and Cheshire) Signal Regiment, a unit of the United Kingdom Army
 * 33rd Infantry Regiment (United States), a unit of the United States Army
 * 33rd Virginia Infantry, a unit of the Confederate (South) Army during the American Civil War
 * 33rd Regiment (Vietnam People's Army), a unit of the PAVN.