Favorinus blianus is a species of sea slug, an aeolid nudibranch in the family Facelinidae.

The maximum recorded length is 30 mm.

[1] This species was described from Pembrokeshire, Wales[1] where it is a scarce animal.

It has also been reported from Norway, England, Denmark, and Galicia, NW Spain.

This Facelinidae-related article is a stub.