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 pro-Union sympathizers. Arkansas had the third smallest white population out of the Confederate states, but more whites joined the Union Army from that state than any other besides Tennessee. In addition, 5,526 African-Americans served in Union units raised in Arkansas. The list of Confederate units is shown separately.