| Cyperus borbonicus Steud., 1854 |
| Cyperus botterii Boeckeler, 1896 |
| Cyperus bourgaei C.B. Clarke ex Lundell, 1934 |
| Cyperus brainerdii Britton, 1897 |
| Cyperus brazas Steud., 1855 |
| Cyperus breedlovei G.C. Tucker, 1986 |
| Cyperus brevifolius (Rottb.) Endl. ex Hassk., 1844 |
| Cyperus breviradiatus Liebm., 1850 |
| Cyperus brizaeus J. Presl & C. Presl, 1828 |
| Cyperus bromoides Link, 1820 |
| Cyperus brownii Roem. & Schult., 1817 |
| Cyperus brunneus Sw., 1797 |
| Cyperus buchananii Boeckeler, 1888 |
| Cyperus buckleyi Britton ex J.M. Coult., 1894 |
| Cyperus calderoniae S. González, 1985 |
| Cyperus californicus S. Watson, 1880 |
| Cyperus callophorus G. Mey., 1818 |
| Cyperus camphoratus Liebm., 1850 |
| Cyperus canus J. Presl & C. Presl, 1828 |
| Cyperus caracasanus Kunth, 1837 |