Arthur Lockwood Wagner (March 16, 1853 – June 17, 1905) was a United States brigadier general and military instructor.

Following his transfer to Fort Leavenworth, Kansas the next year, Wagner accepted a personal request by the commandant of the United States Infantry and Cavalry School to be an assistant instructor of tactics and the military arts.

Promoted to major in 1896, Wagner was transferred to the adjutant general's office of the War Department as Chief of the Military Information Division.

During the Philippine–American War, Wagner served in various staff positions, reaching the rank of colonel before returning to the United States in 1902 as adjutant general of the Department of the Lakes at Chicago.

Wagner lived in Asheville, North Carolina as a staff officer for the recently established Army War College at the Washington Barracks (Fort Lesley McNair), until his death in Asheville, North Carolina on June 17, 1905, the same day in which he had won promotion to brigadier general.