3rd Arkansas Infantry Regiment

3rd Arkansas Infantry Regiment may refer to:


 * 3rd Arkansas Infantry Regiment (Confederate States), a unit of the Confederate States Army during the American Civil War
 * 3rd Arkansas Consolidated Infantry Regiment, another unit of the Confederate States Army during the American Civil War
 * 3rd Regiment, Arkansas State Troops, another unit in Confederate service during the American Civil War
 * 3rd Arkansas Infantry Regiment (Union), a unit that served in the Union Army during the American Civil War
 * 3rd Arkansas Infantry Regiment (African Descent) (eventually named 56th United States Colored Infantry), another Union Army unit during the American Civil War