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

It has been reported from Réunion Island and southern Thailand.

[3] This nudibranch has a grey or pink dorsum with compound tubercles with white apices.

It is a moderately large Phyllidiid, growing to at least 45 mm in length.

It is similar to Phyllidiopsis krempfi but that species has a pattern of black lines on the back.