P78

P78 or P-78 may refer to:


 * FB P-78, a pistol
 * HMS Voracious (P78), a submarine of the Royal Navy
 * INS Kadmatt (P78), a corvette of the Indian Navy
 * North American XP-78, a variant of the North American P-51 Mustang
 * P78 road (Ukraine)
 * Papyrus 78, a biblical manuscript
 * Solwind, a NASA space probe
 * P78, a state regional road in Latvia
 * HS Karathanasis (P 78), a Roussen-class fast attack craft of the Hellenic Navy
 * RSS Sea Dragon (P78), a missile gunboat of the Republic of Singapore Navy