
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.

The 1st Arkansas Cavalry Regiment (1862–1865) was a cavalry regiment from the state of Arkansas that served in the Union Army during the American Civil War.

The 1st Arkansas Colored Light Artillery Battery was an artillery battery that served in the Union Army during the American Civil War. The regiment was composed of African American enlisted men commanded by white officers and was authorized by the Bureau of Colored Troops which was created by the United States War Department on May 22, 1863.

The 1st Battalion Arkansas Volunteer Infantry (1862) was an infantry battalion that served in the Union Army during the American Civil War. Although Arkansas joined the Confederate States of America in 1861, not all of its citizens supported secession.

The 1st Regiment Arkansas Volunteer Infantry (1863–1865) was an infantry regiment that served in the Union Army during the American Civil War. Although Arkansas joined the Confederate States of America in 1861, not all of its citizens supported secession. Arkansas formed some 48 infantry regiments to serve in the Confederate Army, but also formed another 11 regiments that served in the Union Army.

The 1st Arkansas Light Artillery Battery (1863–1865) was an artillery battery that served in the Union Army during the American Civil War. Although Arkansas joined the Confederate States of America in 1861, not all of its citizens supported secession.

The 3rd Regiment Arkansas Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.

The 4th Regiment Arkansas Volunteer Infantry (Union) (1863–1865) was an infantry regiment that served in the Union Army during the American Civil War. Although Arkansas joined the Confederate States of America in 1861, not all of its citizens supported secession. Arkansas formed some 48 infantry regiments to serve in the Confederate Army, but also formed another 11 regiments that served in the Union Army.

The 46th United States Colored Infantry was an infantry regiment that served in the Union Army during the American Civil War. The unit was originally designated as the 1st Arkansas Infantry Regiment. The regiment was composed of African American enlisted men commanded by white officers and was authorized by the Bureau of Colored Troops which was created by the United States War Department on May 22, 1863.

The 54th United States Colored Infantry was an infantry regiment that served in the Union Army during the American Civil War. The regiment was composed of African American enlisted men commanded by white officers and was authorized by the Bureau of Colored Troops which was created by the United States War Department on May 22, 1863.

The 57th United States Colored Infantry was an infantry regiment that served in the Union Army during the American Civil War. The regiment was composed of African American enlisted men commanded by white officers and was authorized by the Bureau of Colored Troops which was created by the United States War Department on May 22, 1863.