The genus name Cyrtosia may refer to:
- Animalia:
- Cyrtosia Perris, 1839 (Insecta, Diptera, Mythicomyiidae)
- Cyrtosia Packard, 1864, junior homonym = Packardia Grote & Robinson, 1866 (Insecta, Lepidoptera, Limacodidae)
- Plantae:
- Cyrtosia Blume (1825) (Magnoliophyta, Orchidaceae)