- Pacta sund servanada – Treaties are legally binding.
- Palimony – Money which a court orders a man to pay regularly to a woman with whom he been living and from whom he has separated.
- Par delictum – Equal fault.
- Pari Materia – Of the same matter; on the same subject
- Pari passu – On an equal footing.
- Partus sequitur ventrem – The offspring follows the mother.
- Pater est quem nuptiae demonstrant – The father is he whom the marriage points out.
- Peccata contra naturam sunt gravissima – Wrongs against nature are the most serious.
- Pendente lite nihil innovetur – During litigation nothing should be changed.
- Per curiam – In the opinion of the court.
- Per Incuriam – By Mistake
- Per minas – By means of menaces or threats.
- Per quod – By reason of which.
- Per se – By itself; taken alone.
- Persona non-grata – Person not allowed in a country/Person not wanted in a country/Person prohibited in a country.
- Post mortem – After death.
- Prima facie – On the face of it.
- Prima impressionis – On first impression.
- Pro hac vice – For this occasion.
- Pro rata – In proportion.
- Pro tanto – So far, to that extent.
- Pro tempore – For the time being.
- Publici juris – Of public right.
