Benjamin Cushing Duniway (November 21, 1907 – August 23, 1986) was a United States federal judge.
Born in Stanford, California, Duniway received a B.A. from Carleton College in 1928, an LL.B. from Stanford Law School in 1931., and a B.A. from Oxford University in 1933. He received a M.A. from Oxford University in 1964. He was in private practice in San Francisco, California from 1933 to 1942. He was a regional attorney of the U.S. Office of Price Administration, in San Francisco, California and in Washington, D.C. from 1945 to 1947 before returning to private practice in San Francisco until 1959. He was a Justice of the First District Court of Appeals of California from 1959 to 1961.
On September 14, 1961, Duniway was nominated by President John F. Kennedy to a seat on the United States Court of Appeals for the Ninth Circuit vacated by Albert Lee Stephens, Sr.. Duniway was confirmed by the United States Senate on September 21, 1961, and received his commission the following day. He assumed senior status on October 5, 1976, and served in that capacity until his death, in Stanford, California.