P34

P34 or P-34 may refer to:

Vessels

 * ARA Santísima Trinidad, a frigate of the Argentine Navy
 * HMS Ultimatum (P34), a submarine of the Royal Navy
 * INS Ajay (P34), a corvette of the Indian Navy

Other uses

 * Chuwabu language
 * Cyclin-dependent kinase 1
 * Papyrus 34, a biblical manuscript
 * Phosphorus-34, an isotope of phosphorus
 * Tyrrell P34, a Formula One race car
 * Wedell-Williams XP-34, a cancelled American fighter aircraft
 * P34, a state regional road in Latvia