P81

P81 may refer to:

• Consolidated Vultee XP-81, an American experimental fighter aircraft
• {{HMAS|Acute|P 81}}, a patrol boat of the Royal Australian Navy
• {{HMS|Varne|P81}}, a submarine of the Royal Navy
• {{INS|Katchall|P81}}, a corvette of the Indian Navy
• Papyrus 81, an early copy of the New Testament in Greek
• P81, a state regional road in Latvia

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