Pollia undosa, common name : the waved goblet, is a species of sea snail, a marine gastropod mollusk in the family Pisaniidae, the true whelks.

Usually the shell has dark brown ribs and orange background, but there are several different variations of color.

It is an active hunter of other molluscs, feeding on snails, slugs, mussels and clams.

The six whorls are moderate, pretty distinct, and provided with decurrent, subnodulous striae, of a brownish or blackish red.

The outer lip, which is thickened by age, is denticulated throughout its whole length, and furrowed internally.