Euchelus asper is a species of sea snail, a marine gastropod mollusc in the family Chilodontaidae.

Its color is dull ashen, dotted with brown, rosy, and black.

The 5½-6 convex whorls are separated by profound sutures, the first one eroded, the rest rough.

The globose body whorl is rounded, descending, and convex beneath.

It is also known under the form Euchelus asper quadricarinatus (Holten, H.S., 1802) (synonym: Trochus alabastrum Reeve, 1858), common name the four-keeled margarite.