| Polypodium riograndense (T. Wendt) Mickel, 2004 |
| Polypodium rivulare Vahl, 1807 |
| Polypodium rosei Maxon, 1916 |
| Polypodium rossii Christ ex H. Ross, 1912 |
| Polypodium rostratum Humb. & Bonpl. ex Willd., 1810 |
| Polypodium rosulatum Christ, 1896 |
| Polypodium rude Kunze, 1839 |
| Polypodium rzedowskianum Mickel, 2004 |
| Polypodium salicifolium Vahl, 1807 |
| Polypodium sanctae-rosae (Maxon) C. Chr., 1913 |
| Polypodium saxicola Baker ex Jenman, 1877 |
| Polypodium schaffneri Fée, 1857 |
| Polypodium scouleri Hook. & Grev., 1829 |
| Polypodium semicordatum Sw., 1788 |
| Polypodium semihirsutum Klotzsch, 1847 |
| Polypodium semihirsutum var. fuscosetosum Hieron., 1904 |
| Polypodium senile Fée, 1857 |
| Polypodium serpentinum Christ, 1906 |
| Polypodium serrulatum (Sw.) Mett., 1856 |
| Polypodium sessilifolium Desv., 1827 |