P81 may refer to:
*
Consolidated Vultee XP-81, an American experimental fighter aircraft
* , a patrol boat of the Royal Australian Navy
* , a submarine of the Royal Navy
* , a corvette of the Indian Navy
*
Papyrus 81
Papyrus 81 (in the Gregory-Aland numbering), designated by 𝔓81, is an early copy of the New Testament in Greek. It is a papyrus manuscript of the First Epistle of Peter. The surviving texts of 1 Peter are verses 2:20-3:1,4-12. The manuscript ...
, an early copy of the New Testament in Greek
* P81, a
state regional road in Latvia
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