Frederick George Hamley (October 24, 1903 – May 5, 1975) was a United States federal judge.
Born in Seattle, Washington, Hamley received a B.A. from the University of Washington, and an LL.B. from the University of Washington School of Law in 1932. He was in private practice in Seattle, Washington from 1932 to 1938. He was a Superintendent, Seattle Water Department, Washington in 1938. He was an Assistant district counsel, U.S. Bureau of Reclamation, Coulee Dam from 1938 to 1940. He was a Special assistant state attorney general/legal advisor to the governor, State of Washington from 1940 to 1941. He was a Director, Department of Public Service, State of Washington from 1941 to 1943. He was an Assistant general solicitor, National Association of Railroad and Utilities Commissioners from 1943 to 1945. He was a General solicitor, National Association of Railroad and Utilities Commissioners from 1945 to 1949. He was a Justice, Washington State Supreme Court from 1949 to 1956. He was a Chief justice from 1955 to 1956.
Hamley was a federal judge on the United States Court of Appeals for the Ninth Circuit. Hamley was nominated by President Dwight D. Eisenhower on May 22, 1956, to a seat vacated by Homer Truett Bone. He was confirmed by the United States Senate on June 29, 1956, and received his commission on July 2, 1956. He assumed senior status on July 6, 1971. Hamley served in that capacity until May 5, 1975, due to his death.