Oates is a surname. Notable people with the surname include:
- Adam Oates (born 1962), Canadian professional ice hockey player
- Alice Oates (1849–1887), actress and musical theatre pioneer
- Colin Oates (born 1983), English judoka
- Corey Oates (born 1994), Australian rugby league player
- Cynthia de la Vega Oates, Mexican model
- Dan Oates, American police chief
- Delores Riley Oates, American politician
- Denese Oates (born 1955), Australian artist
- Eugene William Oates (1845–1911), English naturalist
- Frank Oates, British African explorer
- Graham Oates (footballer, born 1943), English footballer
- Graham Oates (footballer, born 1949), English footballer
- Jackie Oates (born 1983), English folk musician
- John Oates (disambiguation)
- Joyce Carol Oates (born 1938), American writer
- Lawrence Oates, British Antarctic explorer
- Lynette Frances Oates (1921–2013), Australian linguist
- Reginald Oates (born 1950), American spree killer
- Sheila Oates (born 1939), British and Australian mathematician
- Simon Oates, British actor
- Stephen B. Oates, American author and biographer
- Thomas Oates (disambiguation)
- Titus Oates, 17th-century perjurer
- Wallace Eugene Oates, American economist
- Warren Oates, American character actor
- William Oates (disambiguation)