List of Arkansas Civil War Union units
Like almost all Southern states during the American Civil War, Arkansas provided a number of units to fight for the Union organized from African-Americans and Northern sympathizers. Despite having the third smallest white population of any Confederate state, Arkansas supplied more troops for the Union army than any other Confederate state except Tennessee. A total of 5,526 African-Americans served in Union units raised from the State of Arkansas. The list of Confederate units is shown separately.
| ARKANSAS | NOTES |
| 1st Arkansas Cavalry Regiment | |
| 2nd Arkansas Cavalry Regiment | |
| 3rd Arkansas Cavalry Regiment | |
| 4th Arkansas Cavalry Regiment | |
| 1st Arkansas Light Artillery Battery | |
| 1st Arkansas Light Artillery Battery | Also known as Battery "H" of the 2nd U.S. Light Artillery Regiment. |
| 1st Arkansas Infantry Battalion | |
| 1st Arkansas Infantry Regiment | |
| 1st Arkansas Infantry Regiment | Also known as the 46th U.S. Infantry Regiment. |
| 2nd Arkansas Infantry Regiment | |
| 2nd Arkansas Infantry Regiment | Also known as the 54th U.S. Infantry Regiment. |
| 3rd Arkansas Infantry Regiment | Failed to complete organization. |
| 3rd Arkansas Infantry Regiment | Also known as the 56th U.S. Infantry Regiment. |
| 4th Arkansas Infantry Regiment | Failed to complete organization. Transferred to the 2nd Arkansas Infantry Rgt. |
| 4th Arkansas Infantry Regiment | Also known as the 57th U.S. Infantry Regiment. |
| 5th Arkansas Infantry Regiment | Also known as the 112th U.S. Infantry Regiment. |
| 6th Arkansas Infantry Regiment | Also known as the 113th U.S. Infantry Regiment. |
| 11th United States Colored Infantry Regiment | - |