Admiral John Grouille Williams Jr. (July 24, 1924 – October 4, 1991) was a four-star admiral who served as Chief of Naval Material (CNM), 1981–1983.

Williams was born on July 24, 1924, in Portland, Oregon, the son of John G. and Julia (Hoare) Williams.

Williams graduated from the United States Naval Academy in 1946 as a member of the class of 1947.

He retired from the navy in 1983 and died on October 4, 1991, of lung cancer.

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