Zhanghenglong is an extinct genus of herbivorous hadrosauroid iguanodont dinosaur known from the Late Cretaceous (middle Santonian stage) Majiacun Formation in Xixia County of Henan Province, China.

The specific name refers to Yangcheng, an administrative unit during the Eastern Zhou, partially coinciding with the present Henan.

[1] The holotype, XMDFEC V0013, was found in the Majiacun Formation dating from the middle Santonian, about eighty-five million years old.

The paratype is XMDFEC V0014, a partial skeleton lacking the skull, including five back vertebrae, ribs, a shoulder blade and the right ulna.

The new genus and species significantly differs from other known members of Hadrosauroidea in having two distinct autapomorphies (strongly deflected posteroventrally posterior third of the maxilla relative to the anterior two thirds of it and dentary teeth with crowns of both median and distally offset primary ridges) and a unique combination of features.