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

[2][3] This species has been reported from NW Australia, Indonesia, Malaysia, the Philippines and the Solomon Islands.

[4][5] Goniobranchus leopardus can reach a maximum size of 6 cm length.

The margin of the mantle is white with at the external border a fine purple to electric blue line.

The branched gill has a whitish external side, the internal surface is golden.