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