Friday is a surname. Notable people with the surname include:
David Friday (1876–1945), American educator Elmer Otto Friday (1924–2006), American judge and politician Fred Friday (born 1995), Nigerian footballer Gavin Friday (born 1959), Irish singer, composer and painter Hershel Friday (1922–1994), American lawyer Mike Friday (born 1972), English rugby player and coach Nancy Friday (1933–2017), American author Pat Friday (1921–2016), American singer Robin Friday (1952–1990), English footballer Tim Friday (born 1961), American ice hockey player William C. Friday (1920–2012), American educator
See also Friday (given name) Freitag (disambiguation) and Freytag as a name in German