| Piper pictamentum Trel., 1938 |
| Piper pittieri C. DC., 1890 |
| Piper plantagineum Lam., 1791 |
| Piper pogonioneuron Trel. & Standl., 1952 |
| Piper politifolium Callejas, 2020 |
| Piper pothomorphe (Miq.) C. DC., 1869 |
| Piper pseudoasperifolium C. DC., 1869 |
| Piper pseudofuligineum C. DC., 1872 |
| Piper pseudolindenii C. DC., 1872 |
| Piper psilorhachis C. DC., 1898 |
| Piper punctulatum Standl. & Steyerm., 1952 |
| Piper purpusianum Trel., 1926 |
| Piper purulhanum C. DC., 1920 |
| Piper quadrifolium L., 1762 |
| Piper realgoanum C. DC., 1872 |
| Piper reflexum L. f., 1781 |
| Piper rohrii C. DC., 1869 |
| Piper rosei C. DC., 1920 |
| Piper rotundifolium L., 1753 |
| Piper rugosum Lam., 1791 |