William Gwin may refer to:
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William M. Gwin
William McKendree Gwin (October 9, 1805 – September 3, 1885) was an American medical doctor and politician who served in elected office in Mississippi and California. In California he shared the distinction, along with John C. Frémont, of bein ...
(1805–1885), American medical doctor and politician
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William Gwin (naval officer)
William Gwin (6 December 1832 – 3 January 1863) was an officer in the United States Navy who was killed in action during the American Civil War. One of the most promising officers in the nation, with extensive command and combat experience, Gwin ...
(1832–1863), officer in the United States Navy during the American Civil War
{{hndis, Gwin, William