| Cyperus baldwinii Torr., 1836 |
| Cyperus bangianus Gand., 1919 |
| Cyperus barrancae M.E. Jones, 1933 |
| Cyperus bipartitus Torr., 1836 |
| Cyperus bipontinii Boeckeler, 1857 |
| Cyperus blepharoleptos Steud., 1854 |
| 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 brevifolius var. brevifolius (Rottb.) 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 |