1st Arkansas Infantry Regiment
- 1st Arkansas 30 Day Volunteer Regiment
- 1st Arkansas Cavalry Regiment (disambiguation)
- 1st Arkansas Colored Infantry Regiment
- 1st Arkansas Consolidated Infantry Regiment
- 1st Arkansas Field Battery
- 1st Arkansas Infantry Battalion
- 1st Arkansas Infantry Regiment (Confederate)
- 1st Arkansas Infantry Regiment (Union)
- 1st Arkansas Light Artillery
- 1st Battalion, Arkansas State Troops
- 1st Regiment, Arkansas State Troops