The common sole or Dover sole, Solea solea, is a species of fish in the Soleidae family. It has a preference for relatively shallow water with sand or mud covering the bottom. It is found in the Eastern Atlantic ocean, from the south of Norway to Senegal, and in almost all of the Mediterranean Sea. In the winter it withdraws to the somewhat warmer waters of the Southern North Sea.

The small eyes are close to each other on the right-hand side of the body. This gives the fish the possibility of lurking half-buried in the sand for passing prey. The common sole, just like all other flatfish, is born as an "ordinary" fish with one eye on each side of the body. The young metamorphose to flatfish when they are about one cm long. The common sole approaches a maximum length of approximately 70 cm.

Chefs prize Dover sole for its mild, buttery sweet flavor and versatility and for its ease of filleting. The fish yields fillets that hold together well in a variety of recipes.

The name "Dover" comes from Dover, the English fishing port landing the most sole in the 19th century.

Because of its prestige, the name "Dover sole" was borrowed to name the eastern Pacific species Microstomus pacificus, a quite distinct species with different culinary properties: the Pacific sole has thinner, less firm fillets and sells for a lower price