BN, Bn or bn may refer to:

• RTV BN, a Bosnian Serb broadcaster
• Bandai Namco, a gaming and entertainment conglomerate
• Barnes & Noble, an American chain of bookstores
• BN (band), Belarusian rock band

• Braniff International Airways (IATA code BN), a former American airline in service from 1928 to 1982
• Britten-Norman, a British manufacturer, based on the Isle of Wight, producing Islander and Trislander aircraft
• La Brugeoise et Nivelles, a Belgian railway rolling stock manufacturer, now part of Alstom
• Burlington Northern Railroad, a United States railroad that operated from 1970 to 1996
• Horizon Airlines (Australia) (IATA code BN), a former Australian airline, ending service in 2004

• Banca Nuova, an Italian bank
• Banque Nationale (disambiguation) several banks
• Barisan Nasional (also known as "National Front"), a political coalition in Malaysia
• British Naturism, the UK naturist society
• Groupe Danone (uronext stock exchange code BN), a French food-products multinational

• Bangladesh Navy
• Battalion, a large unit

• Brunei (ISO 3166: BN), Southeast Asia
• Bahrain (WMO: BN), West Asia
• Benin (FIPS 10-4: BN), West Africa
• Bosnia and Herzegovina (LOC MARC: BN), Europe

• BN postcode area, Sussex, England
• Bandarban District, Bangladesh
• Province of Benevento, Italy
• Bloomington-Normal, Illinois, US

• Baitun Nur Mosque, Calgary, Alberta, Canada

• .bn, Brunei's top-level Internet domain
• BN-reactor, a Russian nuclear reactor class
• Batch normalization, in artificial intelligence
• Benzyl functional group (Bn), in organic chemistry
• Billion (disambiguation) (bn), a number
• Boron nitride, a chemical compound
• Bulimia nervosa, an eating disorder
• Dynkin diagram B_n, in mathematical analysis

• BN (biscuit), a Franco-British brand of baked food
• Bachelor of Nursing, a professional degree
• Bacon Number, an actor's professional proximity to Kevin Bacon
• Bengali language (ISO 639: bn), spoken in eastern South Asia
• Billion (disambiguation)