Dagetichthys marginatus, commonly known as the white-margined sole, is a species of flatfish native to the eastern Atlantic Ocean. Little is known of the abundance or behaviour of this fish, and the International Union for Conservation of Nature has rated its conservation status as being "data deficient".

Description The white-margined sole grows to a standard length of about 50 cm (20 in).The general shape is that of a typical sole. Like other flatfish, the body is flattened laterally and the fish lies on its side. The dorsal fin starts from the edge of the head and has 70 to 76 soft rays. The anal fin has 54 to 63 soft rays. These fins are continuous with pale edges; right pectoral fin is blackish. The upper side of the fish is dark brown, sometimes with darker specks.

Distribution The white-margined sole is native to a relatively narrow distribution in shallow, coastal waters of South Africa.

It is a demersal fish, living in very shallow water at depths less than 2 m (7 ft).