Phyllidiopsis phiphiensis is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Phyllidiidae.

It has been reported from Myanmar, Sri Lanka and India, Kenya and the Maldives.

[3][4] This nudibranch has a white dorsum with three longitudinal black lines interspersed with two raised ridges.

There are black spots bordering the edge of the mantle.

[3] This species feeds on a sponge belonging to the genus Gellius.