Jancso or Jancsó is a Hungarian surname. Notable people with the surname include:
András Jancsó (born 1996), Hungarian footballer Annie Jones (actress) (born Annika Jancsó; 13 January 1967), Australian actor Antal Jancsó (1934–2023), Hungarian tennis player Miklós Jancsó (1921–2014), Hungarian film director and screenwriter Piroska Jancsó-Ladányi (1934–1954), Hungarian serial killer