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

It is a rare species which has also been recorded from Palos Verdes and San Pedro.

[3] This nudibranch has a white dorsum with simple tubercles.

It is a medium-sized Phyllidiid, growing to at least 25 mm in length.

This species feeds on the sponge Hymenamphiastra cyanocrypta.