Trephionus is a genus of ground beetles in the family Carabidae.

There are about 19 described species in Trephionus, found in Japan.

[1][2][3] All the species are reddish brown to black in color with a shiny surface.

Mouthpart appendages and antennae are yellowish to reddish brown, and the legs are light to blackish brown.

This Platyninae-related article is a stub.