- BLSA: Black Law Students Association records, 2014/20213
- Baba Freeman Reston, Virginia collection, 1966/200710
- Baba Freeman Reston, Virginia, collection, 1966/20071
- Barbara Abernathy papers, 1986/200512
- Barbara Cary Johnston Willard Scrapbook, 1800/20061
- Barbara H. Dunn Papers, 1970/20037
- Barbara Howe, History Professor, Research Papers regarding the History of the College of Arts and Sciences, 1870/2005, bulk 1990/20053
- Barbara Lustbader New York City playbills collection, 1957/201223
- Barbara McKnight Benham papers, 1966/20212
- Barnette Collection, Lawyer, Businessman, Educator, Philanthropist, and Chairman Emeritus of Bethlehem Steel Corporation, 1905/202025
- Barton Myers III Papers, 1988/20062
- Base Hospital No. 41 collection, 1905/20091
- Baseball records, 1908/20242
- Ben Benson Collection, 1789/20151
- Benjamin C. Howland papers, 1941/19831