P57 may refer to:
Aircraft Partenavia P.57 Fachiro, an Italian civil utility aircraft Percival P.57 Sea Prince, a British anti-submarine trainer Tucker XP-57, a proposed American fighter
Vessels , a submarine of the Royal Navy , a patrol vessel of the Indian Navy P57 Kasos, a HSY-55-class gunboat of the Hellenic Navy
Other uses P57 (glycoside), an anorectic BRM P57, a Formula One racing car Cyclin-dependent kinase inhibitor 1C Papyrus 57, a biblical manuscript P57, a state regional road in Latvia