P31

P31 may refer to:

Aircraft

• Boulton Paul P.31 Bittern, a British prototype fighter aircraft
• Curtiss XP-31 Swift, an American experimental fighter aircraft
• Percival P.31 Proctor, a British radio trainer and communications aircraft

Vessels

• ARA Drummond (P-31), a corvette of the Argentine Navy
• HMS Uproar (P31), a submarine of the Royal Navy
• INS Kavaratti (P31), a corvette of the Indian Navy
• LÉ Eithne (P31), a ship of the Irish Naval Service
• Maltese patrol boat P31, of the Armed Forces of Malta

Other uses

• Makhuwa language
• Papyrus 31, a biblical manuscript
• Phosphorus-31 (P-31 or ³¹P), a stable isotope of phosphorus
• Pioneer P-31, a failed lunar probe
• P31, a state regional road in Latvia