The European Plaice (Pleuronectes platessa) is a marine (saltwater) fish in the Pleuronectiformes family of flatfish.

The European Plaice is oval-shaped with a thin, laterally compresed body and a small head. It has a small mouth with a single series of small incisor-like teeth. It has dark-green to dark-brown skin, which is blotched with irregular orange spots. It can camouflage its skin to match its environment. Its underside is pearly white. Its skin is smooth with small scales. Both eyes are on the right side of its body (it is called a right-eyed flatfish).