- 29 Boxes
- 2 Boxes (audience spaces)
- 3 Boxing
- 1 Boy and bird (Sculpture)
- 3 Boy and swan (Sculpture)
- 1 Boy Jones, The
- 1 Boy Scouts
- 1 Boyd, D.K. (architect)
- 1 Boyer Bros. Novelties
- 1 Boyle Hotel
- 161 Boys
- 1 Boz Ball
- 1 Bracelets
- 2 Bracony, Guglielmo
- 6 Bradbury & Evans
- 7 Bradbury, William, 1800-1869
- 24 Braddock Street
- 1 Bradford Park
- 1 Bradford, William, 1590-1657. History of Plymouth Plantation
- 1 Bradley Manufacturing Co.
- 3 Bradly Barnard (Firm)
- 3 Braga, Enrico
- 1 Bragg, Braxton, 1817-1876
- 1 Braham, John, 1774-1856
- 5 Brahmanism
- 1 Braille, Louis, 1809-1852
- 1 Braille, Louis, 1809-1852
- 1 Brakes
- 629 Branch libraries
- 1 Branch Office Prudential Insurance Company of America (Firm)
- 8 Branches (plant components)
- 1 Branchtown
- 2 Branchtown Hotel
- 2 Brandy
- 7 Brandywine River
- 2 Brandywine Springs, Delaware
- 4 Brandywine Street
- 1 Branson Machine Co. (knitting machinery)
- 1 Braquenme Freres
- 8 Brass industry
