Goniobranchus tritos is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.

[2][3] This marine species occurs off the Maldives.

[4] Goniobranchus tritos has a cream coloured mantle with round black spots, each of which is outlined with a white line.

There is a broad band of lilac-grey around the mantle and a narrow line of opaque white at the edge.

The gills and rhinophores are grey with white highlights.