Tienshanosaurus (meaning "Tienshan lizard") is a genus of dinosaur from the Late Jurassic. It was a sauropod which lived in what is now China. On 11 September 1928 Chinese geology professor Yuan Fu ("P.L. Yüan") discovered in Xinjiang the remains of about thirty adult and three juvenile sauropods, which he uncovered during the following weeks. The finds, including a fossilized egg, were sent to Beijing where they ultimately became part of the collection of the Institute of Vertebrate Paleontology and Paleoanthropology. In 1937 paleontologist Yang Zhongjian ("C.C. Young") named the type species Tienshanosaurus chitaiensis. The generic name, suggested by Yuan, refers to the Tian Shan, the "heavenly mountains". The specific name refers to the location Chitai or Qitai.