Lioscorpiusis a genus of marine ray-finned fish, belonging to the subfamily Setarchinae, the deep-sea bristly scorpionfishes, part of the family Scorpaenidae.

Lioscorpiusas formally described as a genus in 1880 by the German-born British ichthyologist Albert Günther when he described what was then its only species, L. longiceps, from the Kai Islands in the Banda Sea in Indonesia.

[3] There are currently two recognized species in this genus:[4] Lioscorpius scorpionfishes have a preorbital bone which has a very small first spine.

They have more slender bodies than related genera within the Setarchinae, the depth being around a quarter of the standard length, they also have a thin space between the eyes.

[6] Lioscorpius scorpionfishes are found in the western Pacific from Japan south to Australia, including Vanuatu, New Caledonia and Fiji.