Zizhongosaurus (meaning "Zizhong lizard") is a genus of basal herbivorous sauropod dinosaur which lived in the Early Jurassic (Toarcian) Period of China. It was a large-bodied herbivore characterized by a long neck.

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Zizhongosaurus Temporal range: Middle-Late Toarcian, 178–176 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	†Sauropodomorpha
Clade:	†Sauropoda
Family:	†Vulcanodontidae
Genus:	†Zizhongosaurus Dong in Dong et al., 1983
Species:	†Z. chuanchengensis
Binomial name
†Zizhongosaurus chuanchengensis Dong in Dong et al., 1983

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The genus and its type species Zizhongosaurus chuanchengensis were named in 1983 by Dong Zhiming, in a volume written by himself, Zhou Shiwu, and Zhang Yihong. The generic name is derived from Zizhong County in Sichuan Province. The specific name refers to the town of Chuancheng.^[1]

The type specimens consist of three syntypes: V9067.1 is a partial dorsal vertebra; V9067.2 is a humerus or upper arm; and V9067.3 is a pubis. All specimens likely were part of a single skeleton, collected from the Ziliujing Formation. Zizhongosaurus was described as a small species.^[1]

In 1999 Li Kui mentioned a second species: Zizhongosaurus huangshibanensis^[2] but this has remained an undescribed nomen nudum.

Zizhongosaurus was originally assigned to the Cetiosaurinae but later authors have placed it in either the Vulcanodontidae, as a relative of Barapasaurus, or the Shunosaurinae. It is today often considered a nomen dubium.^{[citation needed]}