Coomania tonkinensis is a species of beetle of the Staphylinidae family, Staphylininae subfamily.

The species is found in Vietnam and Sabah, Malaysia.

[1][2] The elongate 5 mm beetle is shining black with antennae and legs reddish-yellow.

The subtriangual head narrower than the thorax.

Elytra as long and as broad as the thorax.