Hay is an English and Scottish surname shortened from the Scoto-Norman de la Haye. Notable people with the surname Hay include:
Alexander Hay (disambiguation), several people
Andrew Leith Hay (1785–1862), Scottish soldier, politician and author
Ann Hawkes Hay (1745–1785), American soldier
Arthur Hay, several people
Barry Hay (born 1948), Dutch musician
Bill Hay (born 1935), Canadian ice hockey player
Colin Hay (born 1953), Scottish-Australian musician
Cody Hay (born 1983), Canadian figure skater
Dennis Hay (born 1940), Scottish field hockey player and coach
Danny Hay (born 1975), New Zealand soccer player
David Hay (disambiguation), several people
Denys Hay (1915–1994), British historian
Douglas Hay (1876–1967), New Zealand cricket player and administrator
Edward Hay (disambiguation), several people
Elizabeth Hay (disambiguation), several people
Erin Hay (born 1970), American country singer
Fernando Soto-Hay y Garcia
Garry Hay (born 1977), Scottish footballer
George Hay (disambiguation), several people
Gilbert Hay (disambiguation), several people
Graham Hay (born 1965), Scottish footballer (Airdrieonians)
Harry Hay (1912–2002), American gay rights activist
Henry Hay (disambiguation), multiple people
Ian Hay, pen name of John Hay Beith (1876–1952), British schoolmaster and soldier
James Hay (disambiguation), multiple people
Jocelyn Hay (1927–2014), British journalist
John Hay (disambiguation), various including:
John Hay (1838–1905), American politician
John Hay (Henley MP) (1919–1998), British politician
John MacDougall Hay (1879–1919), Scottish novelist
Sir John Dalrymple-Hay, 3rd Baronet (1821–1912), British admiral
Sir John Hay, 6th Baronet (1788–1838), British politician
Lord John Hay (disambiguation), several people
Kathryn Hay (born 1975), Australian politician
Keith Hay (1917–1997), New Zealand businessman
Louise Hay (born 1926), American New Age writer
Louise Hay (1935–1989), French-born American mathematician.
Lucy Hay, Countess of Carlisle (1599–1660), English courtier
Mary Garrett Hay (1857-1928), American suffragist
Mary Hay (actress) (1901–1957), American stage and screen actress
Mavis Doriel Hay (1894-1979), British author and craftswoman
Merle Hay (1896–1917), American soldier
Millar Hay (born 1946), Scottish footballer
Oliver Perry Hay (1846–1930), American palaeontologist
Robert Hay (disambiguation), several people
Roy Hay (horticulturalist) (1910–1989), English horticultural journalist and broadcaster
Roy Hay (musician) (born 1961), British keyboard player
Sir Rupert Hay (1893–1962), British Indian Army officer and administrator in British India
Samuel Ross Hay (1865–1944), American Methodist bishop
Udney Hay (1739–1806), American soldier, politician
Wellington Hay (1864–1932), Canadian politician
Will Hay (1888–1949), British comic actor
William Hay (disambiguation), several people
As aristocratic Scottish family name (see Clan Hay):
John Hay, 1st Lord Hay of Yester (c. 1450 – 1508)
John Hay, 2nd Lord Hay of Yester (died 1513)
John Hay, 3rd Lord Hay of Yester (died 1543)
John Hay, 4th Lord Hay of Yester (died 1557)
William Hay, 5th Lord Hay of Yester (died 1586)
William Hay, 6th Lord Hay of Yester (died 1591)
James Hay, 7th Lord Hay of Yester (died 1609)
John Hay, 8th Lord Hay of Yester (1593–1653) (became Earl of Tweeddale in 1646)
John Hay, 2nd Earl of Tweeddale (1626–1697) (became Marquess of Tweeddale in 1694)
John Hay, 2nd Marquess of Tweeddale (1645–1713)
Charles Hay, 3rd Marquess of Tweeddale (1670–1715)
John Hay, 4th Marquess of Tweeddale (1695–1762)
George Hay, 5th Marquess of Tweeddale (1758–1770)
George Hay, 6th Marquess of Tweeddale (1700–1787)
George Hay, 7th Marquess of Tweeddale (1753–1804)
George Hay, 8th Marquess of Tweeddale (1787–1876)
Arthur Hay, 9th Marquess of Tweeddale (1824–1878)
William Montagu Hay, 10th Marquess of Tweeddale (1826–1911)
William George Montagu Hay, 11th Marquess of Tweeddale (1884–1967)
David George Montagu Hay, 12th Marquess of Tweeddale (1921–1979)
Edward Douglas John Hay, 13th Marquess of Tweeddale (1947–2005)
David Hay, 14th Marquess of Tweeddale (born 1947)
George Hay, 1st Earl of Kinnoull (died 1634)
George Hay, 2nd Earl of Kinnoull (died 1644)
George Hay, 3rd Earl of Kinnoull (died 1650)
William Hay, 4th Earl of Kinnoull (died 1677)
George Hay, 5th Earl of Kinnoull (died 1687)
William Hay, 6th Earl of Kinnoull (died 1709)
Thomas Hay, 7th Earl of Kinnoull (died 1719)
George Henry Hay, 8th Earl of Kinnoull (1689–1758)
Thomas Hay, 9th Earl of Kinnoull (1710–1787)
Robert Hay-Drummond, 10th Earl of Kinnoull (1751–1804)
Thomas Hay-Drummond, 11th Earl of Kinnoull (1785–1866)
George Hay-Drummond, 12th Earl of Kinnoull (1827–1897)
Archibald Hay, 13th Earl of Kinnoull (1855–1916)
George Hay, 14th Earl of Kinnoull (1902–1938)
Arthur Hay, 15th Earl of Kinnoull (1935–2013)
Charles Hay, 16th Earl of Kinnoull (born 1962)
James Hay, 1st Earl of Carlisle (1580–1636)
James Hay, 2nd Earl of Carlisle (1612–1660)
William Hay, 1st Earl of Erroll (died c. 1462)
Nicholas Hay, 2nd Earl of Erroll (died 1470)
William Hay, 3rd Earl of Erroll (died 1507)
William Hay, 4th Earl of Erroll (died 1513)
William Hay, 5th Earl of Erroll (died 1541)
William Hay, 6th Earl of Erroll (c. 1521 – 1541)
George Hay, 7th Earl of Erroll (died 1573)
Andrew Hay, 8th Earl of Erroll (died 1585)
Francis Hay, 9th Earl of Erroll (died 1615)
William Hay, 10th Earl of Erroll (died 1636)
Gilbert Hay, 11th Earl of Erroll (died 1675)
John Hay, 12th Earl of Erroll (died 1704)
Charles Hay, 13th Earl of Erroll (died 1717)
Mary Hay, 14th Countess of Erroll (died 1758)
James Hay, 15th Earl of Erroll (1726–1778)
George Hay, 16th Earl of Erroll (1767–1798)
William Hay, 17th Earl of Erroll (1772–1819)
William George Hay, 18th Earl of Erroll (1801–1846)
William Harry Hay, 19th Earl of Erroll (1823–1891)
Charles Gore Hay, 20th Earl of Erroll (1852–1927)
Victor Alexander Sereld Hay, 21st Earl of Erroll (1876–1928)
Josslyn Victor Hay, 22nd Earl of Erroll (1901–1941)
Diana Denyse Hay, 23rd Countess of Erroll (1926–1978)
Merlin Sereld Victor Gilbert Moncreiffe, 24th Earl of Erroll (born 1948)
