This paper presents an overview of all holoplanktonic gastropods thus far known from NW Spain. Shells of such molluscs are rarely beached. However, holoplanktonic gastropods may live close to the coast in embayments adjoining deeper water, and shells of several species have been found on beaches along such bays. Seven species are newly recorded from the Cantabrian Sea, one is new for NW Spain. In addition, new records from the Galicia Bank west of the Iberian Peninsula and records from Hendaye, just north of the Spanish-French border, are included.