Okenia luna is a species of sea slug, specifically a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.

This species was described from Bahia of Ancón Peru.

Is distributed from Ancon, Lima Peru to Coliumo, Chile This Okenia has a broad body and seven to twelve pairs of lateral papillae.

The diet of this species is a bryozoan, Alcyonidium nodosum.