Ompok argestes, is a species of sheatfishes endemic to Sri Lanka.

[1][2] The male reaches 14.7 cm in length and is a demersal species of fish.

[2] The body and head are mottled greyish brown, with a uniformly convex predorsal profile.

There are two pairs of barbels and the mouth is terminal, with the lower jaw longer than the upper.

A hazy black blotch is present in the humeral region with scattered melanophores on the dorsal, pectoral and caudal fins.