Hippoglossoides platessoides, commonly known as the long rough dab or longhead dab, is a species of flatfish found in the ocean waters of the Northern Hemisphere. Synonyms for this species include Pleuronectes platessoides, Limanda platessoides, and Hippoglossoides platessoides borealis. The long rough dab can be found in waters ranging from shallow bays and estuaries to deeper offshore waters. It is an important commercial fish species in some regions, and is often used in dishes such as fish and chips. Despite its commercial importance, the long rough dab is not currently listed as an endangered species.