The 1st Battalion, 321st Field Artillery Regiment is an inactive field artillery battalion of the United States Army. The battalion served in World War I, World War II, Vietnam and the Global War on Terror with the 82nd Airborne and 101st Airborne Divisions, and with the 18th Field Artillery Brigade. The battalion officially inactivated in March 2014, and its firing batteries were distributed throughout the 82nd Airborne Division.