Northam is a surname. Notable people with the surname include:
Bill Northam (1905-1988), Australian Olympic yachtsman
Jackie Northam, American broadcast reporter
Jeremy Northam (b. 1961), British actor
John Northam (d. 2004), professor emeritus of literature and drama at Cambridge University and father of Jeremy Northam
Ralph Northam (b. 1959), American politician and physician
Mark Northam (b. 1954), Director of the University of Wyoming School of Energy Resources