The units of the Arkansas Militia in the Civil War to which the current Arkansas National Guard has a connection include the Arkansas State Militia, Home Guard, and State Troop regiments raised by the State of Arkansas. Like most of the United States, Arkansas had an organized militia system before the American Civil War. State law required military service of most male inhabitants of a certain age. Following the War with Mexico, the Arkansas militia experienced a decline, but as sectional frictions between the north and south began to build in the late 1850s the militia experienced a revival. By 1860 the state's militia consisted of 62 regiments divided into eight brigades, which comprised an eastern division and a western division. New regiments were added as the militia organization developed. Additionally, many counties and cities raised uniformed volunteer companies, which drilled more often and were better equipped than the un-uniformed militia. These volunteer companies were instrumental in the seizure of federal installations at Little Rock and Fort Smith, beginning in February 1861.

The Arkansas National Guard (ARNG), commonly known as the Arkansas Guard, is a component of the Government of Arkansas and the National Guard of the United States. It is composed of Army and Air National Guard units. The adjutant general's office is located at Camp Robinson MTC, North Little Rock.