William Cadogan may refer to:
- William Cadogan (politician) (1601–1661)
- William Cadogan, 1st Earl Cadogan (1675–1726)
- William Cadogan (childcare) (1711–1797), British physician and childcare writer
- William George Sydney Cadogan (1879–1914), British Army officer
- William Cadogan, 7th Earl Cadogan (1914–1997)
This disambiguation page lists articles about people with the same name.
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