Goniobranchus tennentanus (the gaudy chromodorid) is a species of colourful sea slug in the family Chromodorididae.

Mantle white, with a faint bluish shade, and spangled with golden-coloured and purple spots.

Middle of back drab-brown with bright violet spots, the larger ones with a white centre.

In particular G. tennentanus is described as having a continuous sky blue margin, not purple, and red gills.

The central area is surrounded by an irregular cream band which contains bright yellow spots.