F19

F19 or F-19 may refer to:
 * F-19, a designation for a hypothetical United States fighter aircraft
 * 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