The American smooth flounder (Pleuronectes putnami) is a flatfish of the family Pleuronectidae.

It is a demersal fish that inhabits shallow inshore salt and brackish waters at depths of up to 27 metres (89 ft).

Its native habitat is the temperate waters of the northwestern Atlantic, from Ungava Bay in Quebec, Canada to Rhode Island, United States.

[3] The American smooth flounder inhabits the shallow salt and brackish arctic-boreal waters of the northwestern Atlantic, living inshore on the soft mud bottoms of estuaries, river mouths and sheltered bays.

[3] The diet of the American smooth flounder consists mainly of zoobenthos invertebrates such as crustaceans, molluscs and marine worms.