F39

F39 may refer to:


 * Avia F.39, a bomber aircraft of the Czechoslovakian Air Force
 * BMW X2 (F39), an automobile
 * INS Betwa (F39), a Brahmaputra-class guided missile frigate of the Indian Navy
 * HMS Naiad (F39), a Leander-class frigate of the Royal Navy
 * F-39, Brazilian designation for the Saab JAS 39 Gripen
 * F39, an Egyptian hieroglyph