Melibe viridis is a species of sea slug, a nudibranch, a marine gastropod mollusk in the family Tethydidae.

Its habitat is sandy and muddy areas between 3 m and 15 m deep.

Like some other nudibranch species, M. viridis has an oral veil that it uses to trap prey.

[5][6][7] This species has a particular morphology that easily distinguishes it from other nudibranchs.

The Melibe has a number of pairs of ceratas along the body, each of which acts as a gill.