| Named By: | Lu J, Xu L, Jia S, Zhang X, Zhang J, Yang L, You H, Ji Q in 2009 |
| Time Period: | Early Cretaceous, Aptian-Albian |
| Location: | China, Henan Province - Manchuan Formation |
| Size: | Uncertain due to incomplete remains, but roughly estimated to be around 30 meters long |
| Diet: | Herbivore |
| Fossil(s): | Partial remains including a tibia, vertebrae and ribs |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropodomorpha | Sauropoda | |
Ruyangosaurus (Ruyang County lizard) is a genus of titanosauriform sauropod dinosaur recovered from the Early Cretaceous Haoling Formation of China. The type species is R. giganteus, described in 2009 by a group of scientists from the Chinese Academy of Sciences and the Henan Geological Museum. Along with Huanghetitan and Daxiatitan, Ruyangosaurus is among the largest dinosaurs discovered in Cretaceous Asia.