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 (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 (Northern Ireland politician) (born 1950), Member of the Northern Ireland Assembly
- William Hay, 17th Earl of Erroll (1772–1819), Scottish peer
- William Hay, 18th Earl of Erroll (1801–1846), Scottish peer
- 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
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Famous quotes containing the word hay:
“All who think cannot but see there is a sanction like that of religion which binds us in partnership in the serious work of the world.”
—John Milton Hay (1838–1905)