Cyrtanthus is a genus of perennial, herbaceous and bulbous plants in the family Amaryllidaceae, subfamily Amaryllidoideae.
Cyrtanthus is the sole genus in the African tribe Cyrtantheae.
The placement of Cyrtantheae within subfamily Amaryllidoideae is shown in the following cladogram:
There are over 50 recognized species, all native to central and southern Africa.