Felimare olgae is a species of very colourful sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.

[3] Felimare olgae has a golden-brown body covered in blue and black spots.

The mantle is pale yellow.

The gills are pale yellow outlined with dark-blue and the rhinophores are pale-yellow, tipped with dark blue.

[4] This species can reach a total length of at least 35 mm (1.4 in) and has been observed feeding on the blue sponge Dysidea etheria.