| Piper alpinum Sw., 1788 |
| Piper alushii Callejas, 2020 |
| Piper alveolatifolium Trel., 1929 |
| Piper amalago L., 1753 |
| Piper amalago var. amalago L., 1753 |
| Piper andresense Trel., 1937 |
| Piper angustatum (Kunth) Poir., 1816 |
| Piper angustifolium Lam., 1791 |
| Piper arboreum Aubl., 1775 |
| Piper arboreum subsp. arboreum Aubl., 1775 |
| Piper arborioccupans Trel. ex Callejas, 2020 |
| Piper arieianum C. DC., 1897 |
| Piper arthantopse C. DC., 1866 |
| Piper articulosum D. Parodi, 1878 |
| Piper augustum Rudge, 1805 |
| Piper auritum Kunth, 1816 |
| Piper austromexicanum Trel., 1926 |
| Piper berlandieri C. DC., 1869 |
| Piper bernoullii Callejas, 2020 |
| Piper berteroanum C. DC., 1869 |