Felimare cantabrica is a species of colourful sea slug or dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.

[2][3] This nudibranch is found in the Eastern Atlantic Ocean (Bay of Biscay) and the Atlantic coasts of Spain and Portugal.

[4] Felimare cantabrica has a light and dark blue body, flecked with yellow lines and spots.

Its mantle edge is lined with yellow-light blue-yellow banding.

[5][6] This species can reach a total length of at least 40 mm and has been observed feeding on sponges from the genus Dysidea.