C. cornutus may refer to:
Cerastes cornutus, a viper species Cotylurus cornutus, a helminth species Chaetoceros cornutus, a diatom species in the genus Chaetoceros Citharichthys cornutus, a flounder species in the genus Citharichthys Corydalus cornutus, a dobsonfly species in the genus Corydalus Craspedochiton cornutus, a chiton species in the genus Craspedochiton Culex cornutus, a mosquito species in the genus Culex
See also Cornutus (disambiguation)