List of United States Regular Army Civil War units

Infantry

 * 1st U.S. Infantry Regiment
 * 2nd U.S. Infantry Regiment
 * 3rd U.S. Infantry Regiment
 * 4th U.S. Infantry Regiment
 * 5th U.S. Infantry Regiment
 * 6th U.S. Infantry Regiment
 * 7th U.S. Infantry Regiment
 * 8th U.S. Infantry Regiment
 * 9th U.S. Infantry Regiment
 * 10th U.S. Infantry Regiment
 * 11th U.S. Infantry Regiment
 * 12th U.S. Infantry Regiment
 * 13th U.S. Infantry Regiment
 * 14th U.S. Infantry Regiment
 * 15th U.S. Infantry Regiment
 * 16th U.S. Infantry Regiment
 * 17th U.S. Infantry Regiment
 * 18th U.S. Infantry Regiment
 * 19th U.S. Infantry Regiment

Cavalry

 * 1st U.S. Cavalry Regiment
 * 2nd U.S. Cavalry Regiment
 * 3rd U.S. Cavalry Regiment
 * 4th U.S. Cavalry Regiment
 * 5th U.S. Cavalry Regiment
 * 6th U.S. Cavalry Regiment

Artillery

 * 1st U.S. Artillery Regiment
 * 2nd U.S. Artillery Regiment
 * 3rd U.S. Artillery Regiment
 * 4th U.S. Artillery Regiment
 * 5th U.S. Artillery Regiment