| Piper palmeri C. DC., 1895 |
| Piper pansamalanum C. DC., 1920 |
| Piper papantlense C. DC., 1869 |
| Piper patulum M. Martens & Galeotti, 1843 |
| Piper patzulinum Trel. & Standl., 1952 |
| Piper pellucidum L., 1753 |
| Piper peltatum L., 1753 |
| Piper peracuminatum C. DC., 1920 |
| Piper pergamentifolium Trel. & Standl., 1952 |
| Piper perhispidum C. DC., 1920 |
| Piper phytolaccifolium Opiz, 1828 |
| 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 |