P31

P31, P-31 or P.31 may refer to:

• HMS Uproar (P31), a Second World War British Royal Navy submarine
• LÉ Eithne (P31), a ship in the Irish Naval Service
• ARA Drummond (P-31), an Argentine Navy corvette
• Pioneer P-31, a failed lunar orbiter probe
• Phosphorus-31 or P-31, a stable isotope
• Papyrus 31, a manuscript of the Epistles to the Romans
• P31, a road in Latvia
• P.31 Boulton Paul Bittern, a British night-fighter that never went into production

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