Cuthonella ferruginea is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Cuthonellidae.

[2] This species was described from a single specimen collected at 600 m depth between the Faeroe Islands and Iceland at 64°53′N 10°00′W / 64.883°N 10.000°W / 64.883; -10.000.