Oin, Óin or OIN may refer to:
Folklore and fiction
- Óin, son of Gróin, a Dwarf from J. R. R. Tolkien's writings, companion of Thorin Oakenshield
- Oin-Oin, a character of Swiss folklore
Other
- Open Invention Network, a company specialising in Linux patents
- Oneida Indian Nation, the New York tribe that operates Turning Stone Resort & Casino
- One language, specifically Inebu, by ISO 639-3 code
See also
- Eoin, an Irish name pronounced O-in
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