Jay is a surname. Notable people with the surname include:

• Allan Jay (1931–2023), British world champion épée & foil fencer
• Antoine Jay (1770–1854), French writer
• Antony Jay (1930–2016), British writer
• Bill Jay (1940–2009) photographer, magazine and picture editor, etc
• Candee Jay (born 1981), Dutch musician
• Charlotte Jay (1919–1996), Australian writer
• David Jay (born 1982), American activist
• Douglas Jay (1907–1996), British politician
• Georgia Jay, British actress
• Herman Jay (born 1976), International Aesthetic dentist
• Isabel Jay (1879–1927), British opera singer
• Joey Jay (born 1935), American baseball player
• John Jay (1745–1829), American politician and jurist
• John Jay (1817–1894), American lawyer
• John Jay Schieffelin (1897–1987), an American rear admiral and executive director of the English-Speaking Union
• Jon Jay (born 1985), American baseball player
• Karla Jay (born 1947), American writer
• Margaret Jay, Baroness Jay of Paddington (born 1939), British politician
• Marie-Louise Jaÿ (1838–1925), French businesswoman
• Martin Jay (born 1944), American historian
• Michael Jay, Baron Jay of Ewelme (born 1946), British politician
• Norman Jay (born 1957), British DJ
• Paul Jay (born 1951), Canadian film director and journalist
• Paul L. Jay (born 1946), American literary theorist
• Peter Augustus Jay (1776–1843), American public servant
• Peter Jay (born 1937), British broadcaster and diplomat
• Pierre Jay (1870–1949), American banker
• Ricky Jay (1948–2018), American magician
• Robert Jay (born 1959), English high court judge
• Steve Jay (born 1951), American bassist
• Tony Jay (1933–2006), British actor
• Tyler Jay (born 1994), baseball player
• Vincent Jay (born 1985), French biathlete
• William Jay (minister) (1769–1853), British preacher
• William Jay (jurist) (1789–1858), American jurist
• William Jay (colonel) (died 1915), American army colonel
• William Jay Schieffelin (1866–1955), an American businessman and philanthropist
• William Jay Schieffelin Jr. (1891–1985), an American businessman and philanthropist

Jay is also a transliteration of the Korean surname Chae.

• Jay (disambiguation)
• Jay (given name)
• Jaye, which refers to people who have either the given name or surname Jaye