Back Hydrotherosaurus Spanish Hydrotherosaurus French הידרותרוזאורוס HE Hydrotherosaurus Italian Hydrotherosaurus Dutch Hidroterossauro Portuguese Hydrotherosaurus Russian Hydrotherosaurus SK Hydrotherosaurus VI 水怪龍屬 Chinese
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| Hydrotherosaurus Temporal range: Maastrichtian,
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Family: | †Elasmosauridae |
| Genus: | †Hydrotherosaurus Welles, 1943 |
| Species: | †H. alexandrae
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| Binomial name | |
| †Hydrotherosaurus alexandrae Welles, 1943
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Hydrotherosaurus (meaning "fisherman lizard") is an extinct genus of elasmosaurid plesiosaur from the Upper Cretaceous (Maastrichtian stage) Moreno Formation of Fresno County, California, USA. The only known species, H. alexandrae, was named for Annie Montague Alexander in 1943 by Samuel Paul Welles.