The Battle of Arkansas Post, also known as Battle of Fort Hindman, was fought from January 9 to 11, 1863, near the mouth of the Arkansas River at Arkansas Post, Arkansas, as part of the Vicksburg Campaign of the American Civil War. Confederate forces had constructed a fort known as Fort Hindman near Arkansas Post in late 1862. In December of that year, a Union force under the command of Major-General William T. Sherman left for an expedition against Vicksburg, without Major-General John A. McClernand because neither Major-Generals Henry Halleck nor Ulysses S. Grant trusted McClernand. After Sherman's force was repulsed at Chickasaw Bayou, McClernand arrived and took command from Sherman in January 1863.

The Vicksburg campaign was a series of maneuvers and battles in the Western Theater of the American Civil War directed against Vicksburg, Mississippi, a fortress city that dominated the last Confederate-controlled section of the Mississippi River. The Union Army of the Tennessee under Major General Ulysses S. Grant gained control of the river by capturing this stronghold and defeating Lieutenant General John C. Pemberton's forces stationed there.