| Named By: | X. Xu, X. Zhang, Q. Tan, X. Zhao & L. Tan in 2006 |
| Time Period: | Late Cretaceous |
| Location: | Mongolia - Iren Dabasu Formation |
| Size: | Estimated about 9 meters long |
| Diet: | Herbivore |
| Fossil(s): | Partial remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropoda | Titanosauria | |
Sonidosaurus is a genus of sauropod dinosaur from the Late Cretaceous. It was a titanosaur which lived in what is now China. The type species, Sonidosaurus saihangaobiensis, was described by Xu, Zhang, Tan, Zhao, and Tan in 2006. It was a small titanosaur, about 9 meters (30 ft) long. It was found in the Iren Dabasu Formation; it was only slightly larger than the contemporaneous giant oviraptorid Gigantoraptor.