F19 or F-19 may refer to: F-19, a designation for a hypothetical United States fighter aircraft F-19 Stealth Fighter, a video game Faucett F-19, a 1940s Peruvian eight-seat transport monoplane Focke-Wulf F 19, a German aircraft Fluorine-19 (F-19 or 19F), an isotope of fluorine , an Italian Regia Marina (Royal Navy) submarine in commission from 1918 to 1930