Felimare gasconi is a species of colourful sea slug or dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.

[2][3] This species was described from Calvi, Haute-Corse, France in the Mediterranean Sea.

Felimare gasconi has a dark blue body with a single white line running centrally along the dorsum.

The gills and rhinophores are dark blue, faintly outlined with white.

This species can reach a total length of at least 15 mm.