| Hydrotherosaurus Temporal range: Late Cretaceous, Maastrichtian |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Family: | †Elasmosauridae |
| Genus: | †Hydrotherosaurus Welles, 1943 |
| Species: | †H. alexandrae |
| Binomial name | |
| Hydrotherosaurus alexandrae Welles, 1943 |
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Hydrotherosaurus (meaning "water beast lizard") is an extinct genus of elasmosaurid plesiosaur from the Upper Cretaceous (Maastrichtian stage) of Fresno County, California, measuring up to 13 m in length. The species H. alexandrae was named for its discoverer, Annie Montague Alexander by Samuel Paul Welles.
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