Back Ahvaytum Czech Ahvaytum German アフヴァイトゥム Japanese Ahvaytum Dutch Ahvaytum Russian Ahvaytum Ukrainian 旷古龙属 Chinese
| Ahvaytum Temporal range: Late Triassic (Carnian), ~
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| Skeletal reconstruction | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha (?) |
| Genus: | †Ahvaytum Lovelace et al., 2025 |
| Species: | †A. bahndooiveche
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| Binomial name | |
| †Ahvaytum bahndooiveche Lovelace et al., 2025
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Ahvaytum (/ɑːˈveɪtəm/ ah-VAY-tum; lit. 'long ago') is an extinct genus of probable basal sauropodomorph saurischian dinosaurs from the Late Triassic Popo Agie Formation of Wyoming, United States. The genus contains a single species, A. bahndooiveche, known from fragmentary hindlimb bones. Ahvaytum represents the oldest known named dinosaur of the ancient Laurasian landmass.