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

It has been reported from Indonesia, Papua New Guinea and Vietnam.

[3] This nudibranch has a blue dorsum with four longitudinal black lines interspersed with raised ridges.

It is similar to Phyllidiopsis xishaensis except for the colour of the rhinophores, which are white in that species.

Phyllidiopsis phiphiensis is also similar but has three instead of four longitudinal black lines on the mantle.