KOI may refer to: the IATA airport code for Kirkwall Airport the Indonesian abbreviation of Komite Olimpiade Indonesia for Indonesian Olympic Committee the KOI character encodings for Cyrillic script the KOI-18 cryptographic key fill device used by the U.S. government a Kepler Object of Interest language code for Komi-Permyak language Potassium hypoiodite See also Koi (disambiguation)