Encyclopedias, Almanacs, Transcripts, and Maps
- Bustos, Juan Bautista (1779–1830)
- Butantã Institute
- Butkus, Richard Marvin ("Dick")
- Butler, Joseph (1692–1752)
- Butler, Samuel (1835–1902)
- Butler, Smedley Darlington (1881–1940)
- Butonese
- Button, Richard Totten ("Dick")
- Butts, Alfred Mosher
- Buyi
- Byers, Walter
- Bylany
- Byrd, William ca. 1542–1623 English Composer
- Byzantine Philosophy
- Caaguazú
- Caaguazú, Battle of
- Caamaño Deñó, Francisco (1932–1973)
- Caamaño y Gómez Cornejo, José María Plácido (1838–1901)
- Caatinga
- Caballería