| Pronaos | pronaos |
| Prolaps | prolapse |
| Pronom | pronoun |
| Prokyon | Procyon |
| Pronoia | pronoia |
| Propanol | propanol |
| Propanon | acetone |
| Provo | Provo |
| Provost | provost |
| Prozeß | trial |
| Prozess | process trial lawsuit litigation |
| Proband | experimentee |
| Prodrom | prodrome |
| Prognose | forecast |
| Prolog | prologue prolog |
| Propan | propane |
| Prosa | prose |
| Proteom | proteome |
| Proton | proton |
| apropos | apropos by the way |