William Cadogan

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)