BRN

The initials BRN may refer to:
 * Bahrain, IOC country code
 * Barisan Revolusi Nasional, an independence movement in Thailand
 * Berne Airport, Switzerland, IATA airport code
 * Brunei, ISO 3-letter country code
 * Bulk Richardson number, in meteorology
 * Bunte Republik Neustadt, a former micronation in Dresden, now a festival