| Piper tacanaense Callejas, 2020 |
| Piper tacticanum Trel. & Standl., 1952 |
| Piper teapense C. DC., 1869 |
| Piper tecutlanum Trel. & Standl., 1952 |
| Piper telanum Trel., 1931 |
| Piper temiscoense Trel. ex Callejas, 2020 |
| Piper tenue Kunth, 1816 |
| Piper terrabanum C. DC., 1892 |
| Piper tetraphyllum G. Forst., 1786 |
| Piper tiliifolium Schltdl. & Cham., 1831 |
| Piper trigonum C. DC., 1866 |
| Piper tuberculatum Jacq., 1792 |
| Piper tuerckheimii C. DC., 1894 |
| Piper tuxpenyana (Trel.) Lundell, 1937 |
| Piper tuxtepecense Trel.ex Callejas, 2020 |
| Piper tuxtlense Callejas, 2020 |
| Piper udimontanum C. DC., 1920 |
| Piper uhdei C. DC., 1869 |
| Piper ulei C. DC., 1898 |
| Piper umbellatum L., 1753 |