William Day

William Day may refer to: * William H. Day (1825–1900), U.S. Black abolitionist * William Day (bishop) (1529–1596), English clergyman * William Day (divine) (died 1684), English clergyman * William Day (sea captain) (1715–1797), Massachusetts naval captain during the American Revolutionary War * William Day (architect), Irish architect from County Wexford * William Day (horseman) (1823–1908), British racehorse trainer * William Day (lithographer) (1797–1845), British lithographer and watercolour artist * William Day (Australian politician) (fl. 1861), member of the New South Wales Legislative Council * William J. Day (1876–1950), judge from Massachusetts * William Louis Day (1876–1936), American judge * William Peyton Day (1886–1966), architect and co-founder of architectural firm Weeks and Day with Charles Peter Weeks * William R. Day (1849–1923), American diplomat and Supreme Court Jus...