BYN

BYN may refer to:
 * Bayankhongor Airport, Mongolia: IATA airport code BYN
 * Belarusian ruble, by ISO 4217 currency code
 * Bilen language: ISO language code BYN
 * Bryan (Amtrak station), Ohio, United States: Amtrak station code BYN
 * Bryn railway station, England, United Kingdom: National Rail station code BYN