Tienshanosaurus (meaning "Tienshan lizard") is an extinct genus of dinosaur from the Late Jurassic.

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.

The holotype, IVPP AS 40002-3, was found near Paikushan, Luanshantze, in sandstone of the Shishugou Formation dating from the Oxfordian.

[3] Due to the fragmentary nature of the material and a limited description, it has not been easy to establish the affinities of Tienshanosaurus.