William Abram Mann (July 31, 1854 – October 8, 1934) was a general officer in the United States Army. He served as the commander of the 17th Infantry Brigade in the Spanish–American War and the 42nd Division ("The Rainbow Division") in World War I. After he retired from military service, he became an executive at the Equitable Trust Company of New York. He resided in Washington D.C., until his death on October 8, 1934. A World War II troop carrier was named for him. The USS W. A. Mann (AP-112), was commissioned in 1943 and served in World War II, the Korean War, and the Vietnam War.