Guanlong (冠龍) is a genus of extinct proceratosaurid tyrannosauroid dinosaur from the Late Jurassic of China.

Guanlong was discovered in the Dzungaria area of China by a joint expedition by scientists from the Institute of Vertebrate Paleontology and Paleoanthropology and George Washington University, and named by Xu Xing and others in 2006.

[1][2] At present, Guanlong is known from two specimens, one discovered on top of the other, with three other individual theropod dinosaurs, in the Shishugou Formation.

The crests of both specimens are thin, delicate structures that likely served as display organs, possibly for events like mating.

[1][2] Guanlong was a relatively small theropod, reaching 3–3.5 m (9.8–11.5 ft) in length and 125 kg (276 lb) in body mass.

[5] However, in 2014 another study was published, instead finding Stokesosaurus and Juratyrant outside the family, which only included Guanlong, Proceratosaurus, Kileskus and Sinotyrannus.

Structures in Dilophosaurus and Monolophosaurus have also been suggested to be for species recognition, but the more gracile crest of Guanlong is more likely for display purposes.