Genus: Sinotyrannus JI, JI & ZHANG, 2009
Etymology: Latin, sino, an ancient name for China and Greek, tyrannus, "tyrant."

Species: kazuoensis JI, JI & ZHANG, 2009
Etymology: "kazuo" in reference to Kazuo County, the county in which the type specimen was discovered, Western Liaoning Province, China.

Holotype: KZV-001

Locality: Dachengzi town, Kazuo County, Western Liaoning Province, China.

Horizon: Jiufotang Formation, Upper Jehol Group.

Biostratigraphy:

Age: Barremian Stage, Lower Gallic Subepoch, Lower Early Cretaceous Epoch, Early Cretaceous.

Material: A disarticulated skeleton including the anterior portions of skull and mandibles, 3 articulated dorsal vertebrae, several dorsal ribs, incomplete ilia, parital manual phalanges, and some other fragmentary bones.