P46 or P-46 may refer to: Vessels , a corvette of the Argentine Navy , a submarine of the Royal Navy , a corvette of the Indian Navy Other uses Curtiss XP-46, an American prototype fighter aircraft Heckler & Koch UCP, a prototype pistol P46 road (Ukraine) Papyrus 46, a biblical manuscripts in Greek Phosphorus-46, an isotope of phosphorus P46, a Latvian state regional road