| Gracilaria cornea J. Agardh, 1852 |
| Gracilaria crassissima (P. Crouan & H. Crouan) P. Crouan & H. Crouan, 1866 |
| Gracilaria crispata Setch. & N.L. Gardner, 1924 |
| Gracilaria cuneata Aresch., 1854 |
| Gracilaria cuneifolia (Okamura) I.K. Lee & Kurogi, 1977 |
| Gracilaria cunninghamii Farlow, 1901 |
| Gracilaria curtissiae J. Agardh, 1885 |
| Gracilaria cylindrica Børgesen, 1920 |
| Gracilaria damicornis J. Agardh, 1852 |
| Gracilaria debilis (Forssk.) Børgesen, 1932 |
| Gracilaria divaricata Harv., 1853 |
| Gracilaria domingensis (Kütz.) Sond. ex Dickie, 1874 |
| Gracilaria ferox J. Agardh, 1852 |
| Gracilaria flabelliformis (P.L. Crouan & H.M. Crouan) Fredericq & Gurgel, 2004 |
| Gracilaria flabelliformis subsp. simplex Gurgel, Fredericq & J.N. Norris, 2004 |
| Gracilaria foliifera W.R. Taylor, 1960 |
| Gracilaria gardneri (Setch.) Gurgel, J.N. Norris & Fredericq, 2018 |
| Gracilaria gracilis (Stackh.) Steentoft, Irvine & Farnham, 1995 |
| Gracilaria guaymasensis E.Y. Dawson, 1944 |
| Gracilaria hancockii E.Y. Dawson, 1944 |