This is a list of Arkansas Civil War Confederate Units, or military units from the state of Arkansas which fought for the Confederacy in the American Civil War.
Like most states, Arkansas possessed a prewar Militia organization, which consisted of seventy one regiments, organized into eight brigades, and divided into two divisions. In addition to its standard militia regiment or regiments, each county was authorized to create up to four Volunteer Militia Companies. While none of the prewar militia regiments were enrolled into Confederate service, many of the existing Volunteer Militia Companies were enrolled into new volunteer regiments. Other new Volunteer Companies were raised with no connection to the prewar militia. Immediately following secession, the State Military Board began organizing regiments of State Troops. Many of these regiments were eventually transferred into Confederate Service. Some Volunteer Regiments were organized under direct authority of the new Confederate Government and were never organized as State Troops. In April 1862, the Confederate Congress passed a conscription law and new companies and regiments were organized almost entirely of conscripted (drafted) men. Volunteers usually went into already existing units. The secession convention also authorized each county to organize Home Guard units made up of men too young or too old or otherwise exempt from conscription or militia service.
At the beginning of the war, the Arkansas Militia consisted of 71 Regiments, which were organized into two divisions, each division made up of four brigades. Every county had at least one regiment, and several had more than one. The Arkansas Militia Act allowed each regiment to form up to four volunteer companies. While the regular militia regiments were required to drill three times per year and were required to supply their own weapons, the volunteer companies drilled much more often and were supplied with equipment by the state.
Only one Militia Regiment, the 45th Arkansas Militia Regiment of Searcy County, was mobilized for service during the war. In the fall of 1861, Governor Rector called up the 45th Militia Regiment to deal with a potential threat to the Confederate government from the anti-war "peace societies". The militiamen arrested suspects in the Ozark Mountains of northwest Arkansas, and many of them were forced to enlist in Marmaduke's 18th Arkansas Infantry Regiment.