83rd Regiment

83rd Regiment or 83rd Infantry Regiment may refer to:


 * 83rd Infantry Regiment (Philippine Commonwealth Army), a unit of the Philippine Commonwealth Army
 * Royal Irish Regiment (1992), a unit of the United Kingdom Army which carries on the lineage of the 83rd Ulster Defense Regiment
 * 83rd Regiment of Foot (Royal Glasgow Volunteers), a unit of the United Kingdom Army
 * Royal Ulster Rifles (83rd (County of Dublin) Regiment of Foot), a unit of the United Kingdom Army
 * 83rd Fighter Aviation Regiment, later Fighter-Bomber regiment, an aviation unit of the Yugoslav Air Force


 * American Civil War regiments:
 * 83rd Illinois Volunteer Infantry Regiment, a unit of the Union (North) Army


 * 83rd Fighter Aviation Regiment, a unit of the Yugoslav Air Force