The flathead chub (Platygobio gracilis) is a species of fish in the carp family, Cyprinidae.

It is also known from three other major river systems in central North America, the Mackenzie, Missouri-Mississippi, and Rio Grande drainages.

It has a slightly curving lateral line and large scales.

The body of the adult may be brownish, olive, or black in color with a silvery wash across the sides and belly.

[4] This fish lives in rivers and large tributaries, often in fast-moving, turbid waters.