海螺是一种贝类软件动物，专指生活在海上的螺。海螺跟螺和蜗牛共同组成了腹足纲。

Buccinum is a genus of medium-sized sea snails, marine gastropod mollusks 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.