High Quality Content by WIKIPEDIA articles! Late Night is an American late-night talk and variety show airing on NBC since 1982. Late Night has been hosted by David Letterman (1982 1993), Conan O'Brien (1993 2009), and Jimmy Fallon (2009 present). The longest-serving host to date was O'Brien, who hosted Late Night with Conan O'Brien for 16 years, from September 1993 to February 2009.