List of Mississippi Union Civil War units

This is a list of units from Mississippi that served in the Union during the American Civil War. Only a single unit of white Union troops was raised within the state, along with several regiments of African-American volunteers, eventually becoming part of the United States Colored Troops. The list of Confederate Mississippi units is shown separately.

Units

 * 1st Battalion, Mississippi Mounted Rifles (Union)
 * 1st Mississippi Cavalry Regiment (African Descent) – redesignated 3rd U.S. Colored Cavalry Regiment
 * 1st Mississippi Heavy Artillery Regiment (African Descent) – redesignated 5th U.S. Colored Heavy Artillery Regiment
 * 2nd Mississippi Heavy Artillery Regiment (African Descent) – redesignated 6th U.S. Colored Heavy Artillery Regiment
 * 1st Mississippi Infantry Regiment (African Descent) – redesignated 51st U.S. Colored Infantry Regiment
 * 2nd Mississippi Infantry Regiment (African Descent) – redesignated 52nd U.S. Colored Infantry Regiment
 * 3rd Mississippi Infantry Regiment (African Descent) – redesignated 53rd U.S. Colored Infantry Regiment
 * 4th Mississippi Infantry Regiment (African Descent) – redesignated 66th United States Colored Infantry Regiment
 * 5th Mississippi Infantry Regiment (African Descent) – organization not completed
 * 6th Mississippi Infantry Regiment (African Descent) – redesignated 58th U.S. Colored Infantry Regiment