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Biography
William Hay may refer to:
William Hay (died 1664) (1594–1664), English politician who sat in the House of Commons variously between 1641 and 1660
William Hay (architect) (1818–1888), Scottish architect
William Hay (Australian politician) (1816–1908)
William Hay (author) (1875–1945), Australian author and essayist
William Hay (bishop) (1647–1707), Scottish bishop
William Hay (Seaford MP) (1695–1755), British Member of Parliament for Seaford, 1734–1755
William Hay (police commissioner) (1794–1855), Joint Commissioner of the London Metropolitan Police, 1850–1855
William Hay, 10th Marquess of Tweeddale (1826–1911), British politician, Member of Parliament for Taunton and Haddington
William Hay, Baron Hay of Ballyore (born 1950), Member of the Northern Ireland Assembly
William Hay, 4th Earl of Kinnoull (d. 1677), Scottish peer
William Hay, 6th Earl of Kinnoull (d. 1709), Scottish peer
William Hay, 17th Earl of Erroll (1772–1819), Scottish peer
William Hay, 18th Earl of Erroll (1801–1846), Scottish peer
William Hay (English cricketer) (1849-1925), English cricketer
William Hay (New Zealand cricketer) (1873-1945), New Zealand cricketer
William Howard Hay (1866–1940), American doctor, author, lecturer and conceiver of the food combining diet
William Perry Hay (1872–1947), American carcinologist
William Rupert Hay (1893–1962), British Indian Army officer and administrator in British India