F13, F 13, F.13 or F-13 may refer to: F 13 Norrköping, a former Swedish Air Force wing F-13 Superfortress, B-29 Superfortress bombers modified for photographic recon duties Junkers F.13, the world's first all-metal airliner LSWR F13 class, a 1905 British 4-6-0 steam locomotive model Florencia 13, a Hispanic gang in Los Angeles Fluorine-13 (F-13 or 13F), an isotope of fluorine Stephen King's F13, a video game f13, Family 13, a group of Greek gospel manuscripts Friday the 13th, which is considered an unlucky day in Western superstition Friday the 13th (franchise), a series of horror films Triskaidekaphobia, the fear of the number 13 a function key labeled F13 on some computer keyboards the ICD-10 code for Mental and behavioural disorders due to use of sedatives or hypnotics a third generation BMW 6 Series coupe Samsung Galaxy F13, an Android-based smartphone manufactured by Samsung Electronics.