The White-spotted Pinion (Cosmia diffinis) is a moth of the Noctuidae family. It is found in central and southern Europe, north it is found up to central England and the southern parts of The Netherlands. There is a disjunct population in Gotland. South, it is found up to Spain, Italy, Russia, northern Greece and Bulgaria. East, it is found up to Lithuania and the Black Sea. The wingspan is 29–35 mm. Adults are on wing from June to August in one generation. The larvae feed on Ulmus species.