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

[1] It has been reported from Thailand, Singapore, Japan, Hong Kong,[3] Indonesia, Fiji and New Caledonia.

[4] Chromodoris tumuliferus is a chromodorid nudibranch with a translucent white mantle and large, carmine-red spots.

[6] The wide distribution and variable colour pattern suggest a possible species complex.

[8] It is very similar in appearance to Goniobranchus kitae but that species has small white spots on the gills and rhinophores.