| Mei long Temporal range: Early Cretaceous,
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| Fossil specimen | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Family: | †Troodontidae |
| Subfamily: | †Sinovenatorinae |
| Genus: | †Mei Xu & Norell, 2004 |
| Species: | †M. long
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| Binomial name | |
| †Mei long Xu & Norell, 2004
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Mei (from Chinese: 寐; pinyin: mèi; lit. 'sleepy') is a genus of duck-sized troodontid dinosaur first unearthed by paleontologists from the Yixian Formation in Liaoning, China in 2004. Mei lived during the Early Cretaceous period. The binomial name of its only species, Mei long (Chinese 寐 mèi and 龍 lóng), means sleeping dragon.