In recent years the number of species known in the genus Deroceras has increased considerably. Since 1981 about 15 new species have been described from Greece, and it seems likely that many more are to follow. In the present paper three more species from different parts of Greece will be added. The material was partly collected by the following persons, to whom we are most indebted: Mr. J.W. Biekart (Utrecht), Mr. R. Leys (De Bilt) and Mr. G.J.M. Visser (Midsland, Terschelling).