William Hitz (April 21, 1872 – July 3, 1935) was an Associate Justice of the United States Court of Appeals for the District of Columbia and previously was an associate justice of the Supreme Court of the District of Columbia.

He was in private practice in Washington, D.C. from 1900 to 1914 and was a special attorney at the United States Department of Justice from 1914 to 1916.

He was confirmed by the United States Senate on January 2, 1917, and received his commission the same day.

His service terminated on February 13, 1931, due to his elevation to the District of Columbia Circuit.

[1] Hitz was nominated by President Herbert Hoover on January 5, 1931, to the Court of Appeals for the District of Columbia (United States Court of Appeals for the District of Columbia from June 7, 1934, now the United States Court of Appeals for the District of Columbia Circuit), to a new Associate Justice seat authorized by 46 Stat.