Jiutaisaurus (meaning "Jiutai lizard") is a genus of sauropod dinosaur from the Quantou Formation of Jilin, China.

The type species, Jiutaisaurus xidiensis, was described by Wu et al. in 2006, and is based on eighteen vertebrae.

In March 2006, Wu Wenhao, Dong Zhiming, Sun Yuewu, Li Chuntian, and Li Tao described the vertebrae as a new genus and species, Jiutaisaurus xidiensis (Chinese: 西地九台龙; pinyin: Xīdì Jiǔtáilóng), named for the discovery site.

[1] Jiutaisaurus xidiensis is known only from the holotype specimen, CAD-02, which was recovered from the Cretaceous-aged Quantou Formation.

[1] In their original description, Wu and colleagues tentatively classified Jiutaisaurus as a titanosaur, also noting similarities to Huabeisauridae and Brachiosauridae.