Goniobranchus rufomaculatus is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
The original description included the following colour information: "Colour cream white, passing into cream yellow towards the margins, which are ornamented with a series of oblong violet spots. The central portion of the mantle is studded with numerous slightly elevated orange dots. Branchiae colourless, tentacles chocolate brown, laminae white. Under surface colourless, with the exception of a light tinge of the dorsal colours, which are transmitted through the pellucid mantle."