| Xinjiangtitan Temporal range: Middle Jurassic,
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha |
| Clade: | †Sauropoda |
| Family: | †Mamenchisauridae |
| Genus: | †Xinjiangtitan Wu et al., 2013 |
| Type species | |
| †Xinjiangtitan shanshanesis Wu et al., 2013
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Xinjiangtitan (Chinese: 新疆巨龙; pinyin: Xīnjiāngjùlóng) is an extinct genus of mamenchisaurid sauropod that lived during the Middle Jurassic of what is now Xinjiang, northwestern China. Its type and only species is Xinjiangtitan shanshanesis (Chinese: 鄯善新疆巨龙; pinyin: Shànshàn Xīnjiāngjùlóng), known from a single incomplete skeleton recovered from the Qiketai Formation. The holotype preserves one of the most complete vertebral columns of any sauropod found in Asia, and has the longest complete neck known for any animal.