Oin
# Oin

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 patent with Linux
* Oneida Indian Nation, the New York tribe that operates Turning Stone Resort & Casino
* One language, specifically Inebu, by ISO 639-3 code
