| Ostrea 
 Temporal range:  | 
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| A lower valve (the attachment valve) of a shell of Ostrea edulis | 
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| Scientific classification | 
| Domain: | Eukaryota | 
 
| Kingdom: | Animalia | 
 
| Phylum: | Mollusca | 
 
| Class: | Bivalvia | 
 
| Order: | Ostreida | 
 
| Superfamily: | Ostreoidea | 
 
| Family: | Ostreidae | 
 
| Subfamily: | Ostreinae | 
 
| Genus: | Ostrea (Linnaeus, 1758)
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| Type species | 
| Ostrea edulis Linnaeus, 1758 
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| Species | 
| See text | 
| Synonyms | 
| Anodontostrea Suter, 1917† Conradostrea Ward & Blackwelder, 1987Cryptostrea Harry, 1985Eostrea Ihering, 1907Lopha (Ostreola) Monterosato, 1884Monoeciostrea Orton, 1928 (genus name unavailable)Myrakeena Harry, 1985† Ostracites Picot de Lapeirouse, 1781Ostraea [sic] (incorrect subsequent spelling by G.B. Sowerby II (1871) and others)Ostrea (Anodontostrea) Suter, 1917† Ostrea (Bellostrea) Vialov, 1936 · accepted, alternate representation† Ostrea (Turkostrea) Vialov, 1936 · accepted, alternate representationOstreola Monterosato, 1884Ostreum da Costa, 1776 (Unjustified emendation)Tiostrea Chanley & Dinamani, 1980Undulostrea Harry, 1985
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Ostrea is a genus of edible oysters, marine bivalve mollusks in the family Ostreidae, the oysters.