Buccinum undatum, the common whelk or the waved buccinum, is a large, edible marine gastropod in the family Buccinidae, the "true whelks".

Buccinum is a genus of medium-sized sea snails, marine gastropod molluscs in the family Buccinidae, the true whelks. Snails in this genus are commonly called whelks, a name shared with several related and unrelated species. The common whelk Buccinum undatum is the most common representative of the genus in the northern Atlantic Ocean.

The Common Whelk (Buccinum undatum) is a large edible marine gastropod. They occupy the Northern Atlantic along the shores of the United Kingdom, Ireland, France, Norway, Iceland, some Arctic islands, and parts of North America as far south as New Jersey.