Calmella gaditana is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusk in the family Flabellinidae.

It has since been found in the Cape Verde Islands, the Canary Islands, Senegal and the Bay of Biscay north to the Bay of Arcachon, France.

[3] This nudibranch is translucent white in colour and reaches 12 mm in length.

It has been reported eating Eudendrium species in the Bay of Arcachon.

[3] It has been found in rock pools on the shore and in shallow water with strong currents.