The 12th Regiment may refer to many military units. 12th Infantry Regiment (South Korea) 12th Regiment Royal Artillery 12th Infantry Regiment (Philippine Commonwealth) 12th Infantry Regiment (USAFIP-NL) 12th Infantry Regiment (United States) 12th Cavalry Regiment (United States) 12th Regiment Massachusetts Volunteer Infantry (American Civil War) 12th Armoured Regiment (Australia) 12th Armoured Regiment (India)