Ceratosoma is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod mollusks in the family Chromodorididae.

[5][6] This nudibranch genus is not to be confused with the muricid gastropod genus Ceratostoma.

The type species is Ceratosoma cornigerum, accepted as Ceratosoma trilobatum (J.E.

Gray, 1827) Species in the genus Ceratosoma include:[5]