Neptunea polycostata is a species of sea snail, a marine gastropod mollusk in the family Buccinidae, the true whelks.
There is one subspecies: Neptunea polycostata aino Fraussen & Terryn, 2007 (synonym: Neptunea polycostata var. sculpturata Golikov, 1963)
Cold northern seas, Sakhalin Island.