Langan is a surname. Notable people with the surname include:
Bill Langan (1955–2010), American yacht designer and naval architect Christopher Michael Langan (born 1952), American known for high IQ Dave Langan (born 1957), Irish footballer Ezequiel Fernández Langan (born 1978), Argentine politician Gary Langan (born 1956), English audio engineer and record producer Glenn Langan (1917–1991), American actor, married to actress Adele Jergens John Langan (born 1969), American horror writer Joy Langan (1943–2009), member of the Canadian House of Commons Patrick A. Langan, American criminologist and statistician Peter Langan (1941–1988), Irish restaurateur Sarah Langan (born 1974), American horror author Sean Langan (born 1964), British journalist and documentary filmmaker Tom Langan, American television producer and writer Tommy Langan (1921–1974), Irish Gaelic footballer