P39

P39 or P-39 may refer to:


 * Bell P-39 Airacobra, an American fighter aircraft
 * HMS P39, a submarine of the Royal Navy
 * P39 road (Ukraine)
 * Papyrus 39, a biblical manuscript
 * Phosphorus-39, an isotope of phosphorus
 * Pier 39
 * Transcription factor Jun, the Fos-binding protein p39
 * P39, a Latvian state regional road