P91 may refer to:
* , a patrol boat of the Royal Australian Navy
*
Papyrus 91
Papyrus 91 (in the Gregory-Aland numbering), designed by 𝔓91, is an early copy of the New Testament in Greek. It is a papyrus manuscript of the Acts of Apostles. The surviving texts of Acts are verses 2:30-37; 2:46-3:2. The manuscript paleogr ...
, a biblical manuscript
*
Ruger P91
The Ruger P series is a line of centerfire semi-automatic pistols made by Sturm, Ruger & Company produced from 1985 to 2013. The P-series pistols were designed for military, police, civilian and recreational use. The designs are largely based on ...
, a pistol
* P91, a
state regional road in Latvia
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