| Piper umbilicatum (Ruiz & Pav.) Vahl, 1805 |
| Piper umbricola C. DC., 1891 |
| Piper unguiculatum Ruiz & Pav., 1798 |
| Piper uspantanense C. DC. ex Donn. Sm., 1894 |
| Piper usumacintense Lundell, 1941 |
| Piper variabile C. DC., 1894 |
| Piper variegatum (Ruiz & Pav.) Pers., 1805 |
| Piper variifolium (Miq.) C. DC., 1869 |
| Piper velutinovarium C. DC., 1920 |
| Piper veraguense C. DC., 1869 |
| Piper verbascifolium (Miq.) C. DC., 1869 |
| Piper vergelense Trel. & Standl., 1952 |
| Piper vestitifolium C. DC., 1920 |
| Piper villiramulum C. DC., 1920 |
| Piper virginicum Trel. & Standl., 1952 |
| Piper williamsii Trel., 1927 |
| Piper wydlerianum C. DC., 1869 |
| Piper xanthostachyum C. DC., 1897 |
| Piper yucatanense C. DC., 1872 |
| Piper yunckeri Trel., 1938 |