William Stephen Walker (April 13, 1822 – June 7, 1899) was a Confederate States Army brigadier general during the American Civil War (Civil War). He was born in Pittsburgh, Pennsylvania but was raised by Robert J. Walker, his uncle, who was a Secretary of the Treasury and U.S. Senator. Walker served as a first lieutenant in the United States Army during the Mexican–American War from 1847 to 1848. He was discharged in 1848. Walker rejoined the army as captain in the 1st U.S. Cavalry Regiment on March 3, 1855 and served until he resigned on May 1, 1861. Walker was wounded in the left arm and lost his left foot during the Battle of Ware Bottom Church during the Overland Campaign. After the war, he lived at Atlanta, Georgia.