Platydoris inornata is a species of sea slug, a dorid nudibranch, shell-less marine opisthobranch gastropod mollusks in the family Discodorididae.

[2] The holotype of this species was collected at the Pinnacle, between Tab Island and Rasch Pass, Madang, New Guinea, 5°09′42″S 145°50′12″E / 5.1618°S 145.8366°E / -5.1618; 145.8366.

Further specimens from Madang, New Guinea and Sumilon Island and Maricaban Island, Philippines were included in the original description.