Gustave Diamond (born 1928) is a United States federal judge.
Born in Burgettstown, Pennsylvania, Diamond was in the United States Navy Seaman from 1946 to 1948. He received an A.B. from Duke University in 1951 and a J.D. from Duquesne University School of Law in 1956. He was a law clerk, Hon. Rabe F. Marsh, U.S. District Court, Western District of Pennsylvania from 1956 to 1961. He was an assistant U.S. Attorney of the Western District of Pennsylvania from 1961 to 1963. He was a U.S. Attorney for the Western District of Pennsylvania from 1963 to 1969. He was in private practice in Pittsburgh, Pennsylvania from 1969 to 1975. He was in private practice in Washington, Pennsylvania from 1976 to 1978.
Diamond was a federal judge on the United States District Court for the Western District of Pennsylvania. Diamond was nominated by President Jimmy Carter on March 22, 1978, to a seat vacated by Edward Dumbauld. He was confirmed by the United States Senate on May 1, 1978, and received his commission on May 2, 1978. He served as chief judge from 1992-1994. He assumed senior status on January 31, 1994.