An oyster is a bivalve mollusc.
Oyster may also refer to:
- Ostreidae, the family of true oysters
Arts, entertainment and media
- Oyster (magazine), Australian magazine about pop culture
- The Oyster, a Victorian erotic magazine published in London
- Oyster (novel), by Janette Turner Hospital
- "Oysters" (short story), by Anton Chekhov
- Oyster, a character in the novel Lullaby by Chuck Palahniuk
- Oyster (album), by Heather Nova
- "Oyster", a 1995 song by Jawbreaker from Dear You
Businesses
- Oyster (company), a commercial streaming service for digital e-books
- Oyster Yachts, a British boat building company
Technology
- Oyster card, a smart card utilising near field communication used on public transport in and around London, UK
- Oyster wave energy converter, a device that transforms the motion of ocean waves to create electricity
- Oyster (company), an e-book subscription service
Other uses
- Oyster (fowl), a cut of poultry
- A shade of the color beige
- Oyster, Virginia, an unincorporated community
See also
- Rocky Mountain oysters, bull testicles served as food
- Oyster Plant (disambiguation)