B
- Baltzell, E. Digby, Papers (UPT 50 B197)
- Barker, George Frederick, Papers (UPT 50 B255)
- Barr, C. Hilyard, Scrapbook (UPS 2 B268)
- Barton, George Aaron, Papers (UPT 50 B293)
- Beck, Aaron T., Papers (UPT 50 B393)
- Beerman, Herman, Papers (UPT 50 B415)
- Bendiner, Alfred, Papers (UPT 50 B458)
- Benjamin Franklin Associates Records (UPF 5.15)
- Benjamin Franklin Memorial (UPG 210)
- Benjamin Franklin Society Records (UPF 501)
- Benjamin Franklin Tercentenary Records (UPV 502)
- Berridge, Harold L., Papers (UPT 50 B533)
- Bicentennial of the United States, 1976, Collection (UPG 325)
- Biological Clubs Records (UPS 45.2)
- Bloomers Records (UPS 509)
- Board of Women Visitors Records (UPC 506)
- Boice, James Morton, Scrapbook (UPT 50 B678)
- Botanical Society of Pennsylvania Records (UPB 1.9BTS)
- Brown, W. Norman (William Norman), Papers (UPT 50 B879)
- Budd, George Davis, Papers (UPT 50 B927)
- Building Dedication Committees Records (UPG 35)
- Buildings and Grounds Office of Construction Engineer Records (UPJ 6.9C)
- Burket, Lester W., Papers (UPT 50 B959)
- Bush, Oliver Paul, Scrapbook (UPT 50 B978)