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- Brelich, Angelo
- Breton
- Brighid
- bristle tail
- Britain, ancient
- British Honduras
- British Legion
- British Medical Association
- British Open golf champions
- British Summer Time
- brittle star
- Broadbills (Eurylaimidae)
- Broads, Norfolk
- Brooks, Louise
- Brower, David Ross (1912 – 2000) American Environmentalist and Conservationist
- brown bear
- Brown Tree Snake
- Brown, Lester R. (1934 – ) American Founder, President and Senior Researcher, Earth Policy Institute
- Brundtland, Gro Harlem (1939 – ) Norwegian Doctor, Former Prime Minister of Norway, Director-General of the World Health Organization