William Hitz (April 21, 1872 – July 3, 1935) was a United States federal judge.
Born in Washington, D.C., Hitz received his undergraduate education from Harvard College. He then received a LL.B from Georgetown University Law School in 1900. He was in private practice in Washington, D.C. from 1900 to 1914. He was a Special attorney of U.S. Department of Justice, Washington, D.C. from 1914 to 1916.
Associate Hitz was a federal judge on the United States District Court for the District of Columbia. Hitz received a recess appointment from Woodrow Wilson on November 15, 1916, to a seat vacated by Thomas H. Anderson. Formally nominated on December 15, 1916. He was confirmed by the United States Senate on January 2, 1917, and received his commission the same day. Hitz served in that capacity until February 13, 1931, due to appointment to another judicial position.
Hitz was a federal judge on the United States Court of Appeals for the D.C. Circuit. Hitz was nominated by President Herbert Hoover on January 5, 1931, to a new seat created by 46 Stat. 785. He was confirmed by the United States Senate on January 28, 1931, and received his commission on February 6, 1931. Hitz served in that capacity until July 3, 1935, due to his death.