- 2 Blunden's Mill
- 3 Blyth, Benjamin, 1746-1787?
- 2 Blyth, Samuel, 1744-1795
- 3 B'nai B'rith
- 1 B'nai B'rith Monument
- 1 Board games (game sets)
- 6 Boarding schools
- 3 Boarding schools (buildings)
- 1 Boardman, Henry A. (Henry Augustus), 1808-1880
- 1 Boards (flat objects)
- 1 Boards of directors
- 1 Boards of trustees
- 4 Boardwalks
- 3 Boars
- 1 Boas, Franziska, 1902-1988
- 6 Boat & ship industry
- 10 Boathouse Row
- 6 Boathouses
- 9 Boating
- 497 Boats
- 1 Boa-Viagem, Baron
- 1 Bobrow Cigar Factory
- 2 Boccaccio, Giovanni, 1313-1375
- 2 Bock & Co.
- 1 Boddington, Thomas
- 5 Bodies of water
- 1 Bodine Street
- 1 Boeckel, W. Metal Goods
- 1 Boggs, Edward Thompson, Architect
- 1 Bogs
- 1 Bohemia, Czech Republic
- 2 Bohland & Fuchs (Firm)
- 1 Bohn, Henry G. (Henry George), 1796-1884
- 2 Boiler rooms
- 13 Boilers
- 1 Boise, Idaho
- 1 Boker, George Henry, 1823-1890
- 2 Bolshevism
- 1 Bolton & Dykeman Co. Car Works
- 1 Bolts & nuts
