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

[2] Phyllidiella nigra can reach a length of about 25–75 mm.

It shows a black background with rounded pink to purplish tubercles over the dorsum.

It is reported to be widespread in the Indo-west Pacific region.

This species occurs on shallow coral reefs, at depths of about 1–6 m.