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

[2][3] This species was described from Sri Lanka.

It is widespread in the Indian Ocean and is similar in colouration to Goniobranchus geometricus from the West Pacific Ocean.

[4] Both species have been reported from South Africa.

[5][6][7]