Bolong (meaning "Bo's dragon") is a genus of iguanodontian dinosaur known from the Early Cretaceous-age Yixian Formation of western Liaoning Province, China.

[2] Bolong was a relatively small animal with an estimated length of four meters and a weight of 200 kilograms.

Autapomorphies that have been established are a cavity at the interface of the lacrimal bone, the maxilla, the backwards branch of the prefrontal bone, consisting of a front-to-rear depth cavity above the edges of the eye socket, the lower protrusion of the predentarium extending rearwardly parallel to the lower edge, the interface of the predentarium that occupies less than two-thirds of the height of the dentarium so that the front tip of the dentarium protrudes a third above the predentarium, and that the teeth in the maxilla have dental crowns of which the main ridge bends at the tip of the tooth.

[1] A second autapomorphy was identified based on the second specimen: the inside of the maxillary teeth are thickened and enclosed from the front and rear cutting edges and is divided in half by a striking vertical ledge.

[4] However, the hind foot was short and robust, more like fully quadrupedal dinosaurs than bipedal ones.