Oxynoe viridis is a species of small sea snail or sea slug, a bubble snail, a marine gastropod mollusk in the family Oxynoidae.

This species occurs in the Philippines, Australia, Indonesia, Egypt, Taiwan and Turkey.

[3] The body is oval or ovate, dorsal region elevated, lateral lobes regular in shape, outline of the edges convex, not meeting; tentacles well-developed, grooved and truncated; eyes immersed immediately behind the tentacles; foot linear, adapted for clasping seaweed; the whole upper surface garnished with more or less numerous cirrigerous appendages.

Color: grass green, mottled with darker, sometimes dotted minutely with brown, or a few blue spots margined with black along the edge of the lateral lobes and on the neck.

The outer lip is disjoined from the apex, very slightly produced posteriorly and truncate.