Branchiostegus sanae, the Mononoke tilefish, is a species of marine ray-finned fish in the family Malacanthidae.

It is currently only known from a single location in the South China Sea, off the southern coast of Hainan.

It can be easily told apart from other members of its genus by the presence of white and red lateral stripes between the eye and the mouth, and faint lateral stripes along the body.

[1] It is named after the character San from the Japanese animated film Princess Mononoke.

This Acanthuriformes-related article is a stub.