| Protolyse | protolysis |
| Photolyse | photolysis |
| Proktologe | proctologist |
| Propolis | propolis |
| Prothese | prosthesis denture |
| Protologie | protology |
| Protonym | protonym |
| Prototyp | prototype antetype prefiguration preliminary model |
| Autolyse | autolysis |
| Keratolyse | keratolysis |
| Homolyse | homolysis |
| Pyrolyse | pyrolysis |
| Prolepse | prolepsis |
| Proselyt | proselyte |
| Prostylos | prostyle |
| Protoplanet | protoplanet |
| Protozoon | protozoan |
| Provost | provost |
| Prognose | forecast |
| Promille | per mil permille permil |