Yizhousaurus, signifying "Yizhou lizard" in reference to the Chuxiong Yi Autonomous Region, is a genus of basal sauropodiform dinosaurs. These creatures thrived in what is now the Lufeng Formation, situated in Yunnan Province of southern China, during the lower Jurassic period.

A remarkably well-preserved and nearly complete skeleton has revealed Yizhousaurus as the most comprehensive basal sauropod currently known, featuring an intact skull. While its name was initially introduced in a 2010 abstract by Sankar Chatterjee, T. Wang, S.G. Pan, Z. Dong, X.C. Wu, and Paul Upchurch, it wasn't officially named and described until 2018. The species at the center of this genus is Yizhousaurus sunae.

The holotype was unearthed in 2002 during an excavation conducted from October 20 to November 23. It comprises a nearly complete skull and lower jaw, along with a total of 31 vertebrae (comprising nine cervical, fourteen dorsal, three sacral, and five caudal vertebrae). Additionally, the fossil includes the shoulder and pelvic girdles, as well as most of both forelimbs and both thighs.