BB

• BB numbers, in the catalogue of works by Béla Bartók
• "BB", a chant supporting Big Brother in Nineteen Eighty-Four
• BB, a 2017 album by Mod Sun
• BB, a character in Beast Wars II: Super Life-Form Transformers
• BB, a character in Fate/Extra CCC and Fate/Grand Order
• Beyond Birthday, a character from the novel Death Note Another Note: The Los Angeles BB Murder Cases
• Big Brother (franchise), a TV reality competition
• 1966 Doctor Who serial The War Machines (production code "BB")
• BB, the protagonist of the Anthology of the Killer series

• BB Bloggingsbooks, an imprint of OmniScriptum
• BB Microlight, a Hungarian aircraft manufacturer
• Banco do Brasil, a Brazilian financial services company
• Bavarian Peasants' League (Bayerischer Bauernbund), a former German political party
• BlackBerry Limited (stock ticker BB), Canadian technology company
• Borderland Beat, a news blog covering the Mexican drug war
• Boys' Brigade, a Christian youth organization

• BB, pseudonym of author and artist Denys Watkins-Pitchford
• BB, monogram of artist Bessie Bamber
• BB, American rapper and member of CUZZOS
• B. B. King (1925-2015), American musician and songwriter
• BB Trickz (Belize Nicolau Kazi, born 2000), Spanish rapper
• Brigitte Bardot (1934-2025), French actress often referred to by her initials BB
• Bernard Berenson (1865-1959) art historian, nickname BB
• Benazir Bhutto (1953-2007), former Pakistani prime minister, nickname BB
• Bipasha Basu (born 1979), Indian actress, nickname BB

• BB postcode area, Blackburn, England
• Barbados (ISO 3166 code BB)
  • .bb, top-level domain for Barbados

• Bell Beaker culture, an archaeological culture in Europe
• Branch and bound, a method for solving optimization problems
• Busy beaver class in computing theory, a type of Turing Machine
• Beta blocker, medication used to manage arrhythmias

Air

• BB Airways, a former Nepalese airline
• Balair, a defunct Swiss airline, IATA airline code BB
• Seaborne Airlines, IATA airline code BB

Rail

• Buckingham Branch Railroad, reporting mark BB, in Virginia, U.S.
• Bürgenstock Funicular (Bürgenstock-Bahn), a Swiss funicular railway
• NZR B^B class, a New Zealand locomotive class
• B-B, a classification of AAR wheel arrangement of railway locomotives
• B (New York City Subway service), known as BB before 1967

Other uses in transportation

• Ferrari Berlinetta Boxer, an Italian sports car
• Toyota bB, a car sold in Japan
• BB, classification of battleships of the United States Navy
• North Sumatra (vehicle registration prefix BB)

• BB (ammunition), used in a BB gun
• Base on balls in baseball, commonly known as a walk
• BB cream, a type of cosmetic