P34 or P-34 may refer to:
Vessels
- ARA Santísima Trinidad (P-34), 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
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