Northam is a surname. Notable people with the surname include:
Bill Northam (1905–1988), Australian Olympic yachtsman
Cyril Northam (1894–1981), English footballer
Jeremy Northam (born 1961), British actor
John Northam (1922–2004), professor emeritus of literature and drama at Cambridge University and father of Jeremy Northam
Ralph Northam (born 1959), American politician and physician