Leonard Horn (August 1, 1926 – May 25, 1975) was an American director of prime time television programs in the 1960s and 1970s and helped shape a number of "classic" adventure and sci-fi series, including Mission: Impossible, Mannix, Voyage to the Bottom of the Sea, and Wonder Woman.
Contemporary fan-sites, such as the viewer polling pages of the Internet Movie Database (IMDB) and TV.com, show Horn's work to have stood the test of time.
Of three first-season episodes he directed for The Outer Limits, two are ranked in the top ten by IMDB users, and one, "The Man Who Was Never Born" is considered among the series' classics.
Horn's single Lost in Space entry ("Invaders from the 5th Dimension") likewise makes the IMDB top ten of the series' first-season episodes.
Horn directed The Magic Garden of Stanley Sweetheart (1970) which Andy Warhol called "the quintessential, most truthful studio-made film about the '60s counterculture".