Aeolidia filomenae is a species of sea slugs, an aeolid nudibranch, a marine gastropod mollusc in the family Aeolidiidae.

Previously confused with Aeolidia papillosa, this species occurs on coasts of the NE Atlantic Ocean from Scotland south to Portugal.

[2] This nudibranch species lives on the Atlantic coast of The British Isles and Europe.

[1] Aeolidia filomenae can be identified by its large number of slightly flattened, hooked cerata on its body except for a triangular area that extends from the rhinophores to the mid dorsum.

There is frequently a white Y-shaped mark on the head, which can be hard to see in pale individuals.