Military Division of the South was a U. S. Army unit established in 1869 during the period of Reconstruction.
Major General H. W. Halleck was assigned to the command of the military division of the South, which was composed of the Departments of the South and Louisiana, of the Fourth Military District (Mississippi and Arkansas), and the Department of the Cumberland (composed of the States of West Virginia, Tennessee, and Kentucky), with its headquarters at Louisville, Kentucky. As the former Confederate states were reconstructed, they were added to this military division. Major General Halleck, in command of the Military Division of the Pacific proceed to his new command as soon as he was relieved by Major General George Henry Thomas. The division was merged into the Military Division of the Atlantic in 1876.