The 321st Field Artillery Regiment (321st FAR) is a field artillery regiment of the United States Army. A parent regiment under the U.S. Army Regimental System, the 321st FAR currently has one active battalion, the 3rd Battalion, 321st FAR, assigned to the 18th Field Artillery Brigade at Fort Liberty (previously Fort Bragg), NC. The battalion is equipped with M142 HIMARS.
The regiment served with the 82nd Division during World War I and with the 101st Airborne Division during World War II. Elements of the regiment have served with the 82nd and 101st Airborne Divisions in Vietnam, and with the 82nd Airborne Division and 18th Field Artillery Brigade during the Global War on Terrorism.