| Epachthosaurus Temporal range: Late Cretaceous,
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| Cast mounted in rearing pose, Museo Egidio Feruglio | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha |
| Clade: | †Sauropoda |
| Clade: | †Macronaria |
| Clade: | †Titanosauria |
| Genus: | †Epachthosaurus Powell, 1990 |
| Type species | |
| †Epachthosaurus sciuttoi Powell, 1990
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Epachthosaurus (meaning "heavy lizard") was a genus of titanosaurian sauropod dinosaur from the Late Cretaceous. It was a basal lithostrotian titanosaur. Its fossils have been found in Central and Northern Patagonia in South America.