Friday is a surname. Notable people with the surname include:
David Friday (1876-1945), American educatorGavin Friday (born 1959), Irish singer, composer and painterHershel Friday (1922-1994), American lawyerMike Friday (born 1972), English rugby player and coachNancy Friday (born 1933), American authorPat Friday (born 1921), American singerRobin Friday (1952–1990), English footballerTim Friday (born 1961), American ice hockey playerWilliam C. Friday (1920-2012), American educator