Yangchuanosaurus is an extinct genus of metriacanthosaurid theropod dinosaur that lived in China from the Middle Jurassic to Late Jurassic periods (Bathonian to Tithonian stages), and was similar (although slightly larger) in size and appearance to its North American and European relative, Allosaurus.

Yangchuanosaurus hails from the Upper Shaximiao Formation and was the largest predator in a landscape that included the sauropods Mamenchisaurus and Omeisaurus and the stegosaurs Chialingosaurus, Tuojiangosaurus and Chungkingosaurus.

A second species from the same locality, Y. magnus, was named by Dong et al. (1983) on the basis of CV 00216, another complete skull and skeleton.

It was collected in the Wujiaba Quarry, near Zigong city, Sichuan, from the lower part of the Shangshaximiao Formation.

A recent restudy of CV 00214 by Daniel Chure (2001) concluded that it represented a new taxon, informally named "Szechuanoraptor dongi", into which Szechuanosaurus zigongensis should also be subsumed.

However, Carrano et al. (2012) suggested that CV 00214 and "S." zigongensis cannot be cospecific as there are no autapomorphies shared between them, and the latter derives from the underlying Xiashaximiao Formation.

Furthermore, Szechuanosaurus zigongensis was found to be closely related to Y. shangyouensis and therefore was designated as a new species of Yangchuanosaurus,[1] though this has been considered questionable by Rauhut and colleagues.

It was first described by Gao (1993), and all specimens were collected from the Middle Jurassic Xiashaximiao Formation in the Dashanpu Dinosaur Quarry of Zigong, Sichuan.

[8] Another informal species, Yangchuanosaurus "longqiaoensis", was briefly mentioned in a faunal listing of the Penglaizhen Formation (initially believed to date to the Late Jurassic but is probably Early Cretaceous (Berriasian – Valanginian) in age)[9] by Li, Zhang and Cai (1999).

[10] However, since it was published solely in a faunal list and not described in detail, it is a nomen nudum and is questionably referable to Yangchuanosaurus.

Yangchuanosaurus shangyouensis Shidaisaurus jinae "Sinraptor" hepingensis Metriacanthosaurus parkeri Sinraptor dongi Siamotyrannus isanensis Allosaurus fragilis Saurophaganax maximus Neovenator salerii Chilantaisaurus tashuikouensis Siats meekerorum Australovenator wintonensis Fukuiraptor kitadaniensis Aerosteon riocoloradensis Megaraptor namunhuaiquii Eocarcharia dinops Concavenator corcovatus Acrocanthosaurus atokensis Shaochilong maortuensis Carcharodontosaurus saharicus Tyrannotitan chubutensis Giganotosaurus carolinii Mapusaurus roseae In 2019, Rauhut and Pol included Y.?