Mexichromis mariei is a species of colourful sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae.

[2][3] Originally described from New Caledonia this species is widespread in the central Indo-Pacific Ocean.

Mexichromis mariei has a white to pale pink mantle with scattered rounded pink-purple tubercles.

The original description describes red spots around the edge of the mantle but there is usually a yellow band which may be slightly broken into patches.

The gills are pale pink with a purple line on the exterior rachis.