| Marambionectes Temporal range: Late Cretaceous
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| Restoration | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Family: | †Elasmosauridae |
| Clade: | †Weddellonectia |
| Genus: | †Marambionectes |
| Species: | †M. molinai
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| Binomial name | |
| †Marambionectes molinai O'Gorman et al., 2024
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Marambionectes (meaning "Marambio Island swimmer") is an extinct genus of weddellonectian elasmosaurid plesiosaur from the Late Cretaceous López de Bertodano Formation of Antarctica. The genus contains a single species, M. molinai, known from a partial skeleton.