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 words william and/or hay:
“A taste for drink, combined with gout,
Had doubled him up forever.”
—Sir William Schwenck Gilbert (1836–1911)
“I’ve never been afraid to step out and to reach out and to move out in order to make things happen.”
—Victoria Gray, African American civil rights activist. As quoted in This Little Light of Mine, ch. 3, by Hay Mills (1993)