| Pleurothallis sanguinolenta Garay & W. Kittr., 1985 |
| Pleurothallis scariosa (Lex.) Lindl., 1842 |
| Pleurothallis schiedei Rchb. f., 1850 |
| Pleurothallis schlechteriana Ames, 1923 |
| Pleurothallis schulzeana Schltr., 1918 |
| Pleurothallis schweinfurthiana L.O. Williams, 1956 |
| Pleurothallis scopula Schltr., 1910 |
| Pleurothallis segoviensis Rchb. f., 1855 |
| Pleurothallis segregatifolia Ames & C. Schweinf., 1924 |
| Pleurothallis sertularioides (Sw.) Spreng., 1826 |
| Pleurothallis setosa C. Schweinf., 1941 |
| Pleurothallis sororia Schltr., 1912 |
| Pleurothallis spathulata A. Rich. & Galeotti, 1845 |
| Pleurothallis spectabilis Ames & C. Schweinf., 1925 |
| Pleurothallis stenostachya Rchb. f., 1845 |
| Pleurothallis stigmatoglossa Lindl., 1859 |
| Pleurothallis subserrata (Schltr.) L.O. Williams, 1940 |
| Pleurothallis tenuispica Schltr., 1915 |
| Pleurothallis testifolium (Sw.) Lindl., 1858 |
| Pleurothallis tikalensis Correll & C. Schweinf., 1965 |