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- Boulding, Kenneth Ewart (1910 – 1993) English Economist, Social Scientist, Writer, and Peace Activist
- Boundary Waters Canoe Area
- Bounty, Mutiny on the
- Bovids I: Kudus, Buffaloes, and Bison (Bovinae)
- Bovids II: Hartebeests, Wildebeests, Gemsboks, Oryx, and Reedbucks (Hippotraginae)
- Bovids III: Gazelles, Springboks, and Saiga Antelopes (Antilopinae)
- Bovids IV: Dikdiks, Beiras, Grysboks, and Steenboks (Neotraginae)
- Bovids V: Duikers (Cephalophinae)
- Bovids VI: Sheep, Goats, and Relatives (Caprinae)
- Bowerbirds (Ptilonorhynchidae)
- Boycott, Geoffrey
- Brāhmaṇas and Āraṇ
- Brāhmo Samāj
- brain damage
- brain disorder
- Brainwashing (Debate)
- Branchiura (Fish Lice)
- Brandon, S. G. F.
- Breakspear, Nicholas