KOI may refer to:

• KOI character encodings, for Cyrillic script

• Indonesian Olympic Committee ()

• Kepler object of interest

• Kirkwall Airport (IATA airport code)

• Komi-Permyak language (ISO language code)

• Movistar KOI (Spanish professional esports organization)

• Torre KOI (skyscraper in Mexico)

• Toronto KOI (Canadian professional esports organization)

See also

• KOI-18, a cryptographic fill device used by the U.S. government

• Koi (disambiguation)