Duncan Stephen Walker (November 11, 1841 – June 3, 1912) was an American Union brevet brigadier general during the period of the American Civil War.
The grandson of Revolutionary War veteran and U.S. District Judge Jonathan Hoge Walker and son of U.S. Senator Robert John Walker(1801-1869) and his wife Mary Blechynden Bache Walker (1808-1873), he was educated at Georgetown University, Lafayette College, and Princeton University. Initially commissioned as a captain of volunteers, Walker served as an assistant adjutant-general during the American Civil War, on the staffs of Major Gen. Nathaniel P. Banks and later Brig.Gen. William H. Emory and Major Gen. Winfield Scott Hancock. He received his appointment as brevet brigadier general dated to March 13, 1865.
He is buried at Arlington National Cemetery.>
He was the great-great-grandson of Benjamin Franklin,