| Eleocharis cellulosa Torr., 1836 |
| Eleocharis coloradoensis (Britton) Gilly, 1941 |
| Eleocharis constricta Schult., 1824 |
| Eleocharis costaricensis Boeckeler, 1896 |
| Eleocharis crassiculmis (Nees) Steud., 1855 |
| Eleocharis cryptica Saarela, P.M. Peterson, S. González & D.J. Rosen, 2010 |
| Eleocharis cyperina (Willd.) Roem. & Schult., 1817 |
| Eleocharis densa Benth., 1840 |
| Eleocharis depauperata (Vahl) Kunth, 1837 |
| Eleocharis disciformis Parish, 1904 |
| Eleocharis dombeyana Kunth, 1837 |
| Eleocharis durandii Boeckeler, 1896 |
| Eleocharis elata Boeckeler, 1872 |
| Eleocharis elegans (Kunth) Roem. & Schult., 1817 |
| Eleocharis elongata Chapm., 1860 |
| Eleocharis exilis Boeckeler, 1888 |
| Eleocharis filiculmis Kunth, 1837 |
| Eleocharis fistulosa Link, 1820 |
| Eleocharis flaccida (Rchb. ex Spreng.) C.B. Clarke, 1900 |
| Eleocharis flavescens (Poir.) Urb., 1903 |