天山龙属（属名：Tienshanosaurus）是种蜥脚下目恐龙，生存于晚侏㑩纪的中国。

在1928年，一位中国地质学家在中国**发现一群蜥脚类化石，包含约30个成年个体、3个未成年个体、以及恐龙蛋化石，这些化石被送到中国科学院古脊椎动物与古人类研究所。在1937年，中国古生物学家杨钟健将化石进行叙述、命名，模式种是奇台天山龙（T. chitaiensis）。属名意为「天山的蜥蜴」；种名则是以奇台县为名。正模标本（编号IVPP AS 40002-3）是一些身体骨骼的骨头，缺少头颅股与下颌，发现于石树沟组，地质年代为牛津阶。这个正模标本被估计身长约12公尺。

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.