Entertainment

• Big Big Train, English progressive rock band
• Big Biz Tycoon, a personal computer game by Animedia
• Bujinkan Budo Taijutsu, a set of Japanese martial arts

People

• Billy Bob Thornton, an American actor-director-singer

Buildings

• Brenner Base Tunnel, a proposed tunnel in the European Alps
• Brighton Ballet Theater, an American dance school in Brooklyn, New York

Other

• Bare Board Test
• Basal body temperature, the body temperature measured immediately after awakening and before any physical activity
• Bhaktivedanta Book Trust, a global book publisher affiliated with the International Society for Krishna Consciousness
• Big Bang Theory
• Binaural Beats Technology
• Black Box Testing
• Bubble tea, a Taiwanese tea drink containing balls of tapioca
• BBT, the ICAO code for Air Bashkortostan