William Belknap may refer to:
- William W. Belknap (1829–1890), lawyer, soldier, government administrator and the United States Secretary of War
- William G. Belknap (1794–1851), United States Army general, father of William W. Belknap
- William Richardson Belknap (1849–1914), president of the Belknap Hardware and Manufacturing Company
- William Burke Belknap (1885–1965), American entrepreneur, son of William W. Belknap
This disambiguation page lists articles about people with the same name.
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