| Yinlong Temporal range: Late Jurassic,
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| Fossil skull | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Neornithischia |
| Clade: | †Ceratopsia |
| Family: | †Chaoyangsauridae |
| Genus: | †Yinlong Xu et al., 2006 |
| Species: | †Y. downsi
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| Binomial name | |
| †Yinlong downsi Xu et al., 2006
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Yinlong (simplified Chinese: 隐龙; traditional Chinese: 隱龍; pinyin: yǐn lóng, meaning "hidden dragon") is a genus of basal ceratopsian dinosaur from the Late Jurassic Period of central Asia. By far the earliest known ceratopsian, it was a small, primarily bipedal herbivore.[1][2]