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

It also occurs in Bali and Anilao in the Philippines.

[3] This nudibranch has a blue background to the dorsum, becoming darker at the margin.

It has a pattern of four longitudinal black lines on the dorsum separating three ridges with tall yellow-capped tubercles surrounded by pale blue.

At the edge of the mantle there are vertical lines of smaller tubercles with darker centres with broken black lines between them.