| Named By: | Xu Xing et al. in 2006 |
| Time Period: | Late Jurassic, 158 Ma |
| Location: | China, Xinjiang Province - Shishugou Formation |
| Size: | 1.2 meters long |
| Diet: | Herbivore |
| Fossil(s): | Single skeleton that is very well preserved |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Marginocephalia | Ceratopsia | |
Yinlong (Yin Long , meaning "hidden dragon") is a genus of basal ceratopsian dinosaur from the Late Jurassic Period of central Asia. It was a small, primarily bipedal herbivore. Yinlong is the oldest and most primitive ceratopsian known.