Tianzhenosaurus, meaning “Tianzhen lizard,” is a genus of ankylosaurid dinosaur from the Late Cretaceous Period. It was discovered in Tianzhen County, near Zhaojiagou Village, in Shanxi Province, China, in the Huiquanpu Formation. It is known from a nearly complete skull and postcranial skeleton. The type species, T. youngi, was named by Pang & Cheng in 1998.

Tianzhenosaurus was a medium-sized ankylosaurian with a skull measuring 11 inches long and a total body length of 13 feet.

Some authors have suggested Tianzhenosaurus is a junior synonym of Saichania chulsanensis, but this has not been widely accepted. It was placed within the Ankylosauridae family in 2004, and placed as a sister group to Pinacosaurus.

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