Tegula rustica is a species of sea snail, a marine gastropod mollusk in the family Tegulidae.

The umbilicate, heavy, solid shell has a conic shape.

The 6–7 whorls are moderately convex or nearly flat, sometimes tumid just below the sutures, and either smooth or longitudinally plicate.

The folds are usually obsolescent, and visible only for a short distance below the sutures.

The columella shows one or two teeth below, expanded above in a white callus, which half surrounds the narrow, deep circular umbilicus.