- BLSA: Black Law Students Association records, 2014/20214
- Baba Freeman Reston, Virginia collection, 1966/20073
- Barbara Abernathy papers, 1986/200515
- 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, 1957/201226
- Barbara McKnight Benham papers, 1966/20212
- Barnette Collection, Lawyer, Businessman, Educator, Philanthropist, and Chairman Emeritus of Bethlehem Steel Corporation, 1905/202048
- Barton Myers III Papers, 1988/20061
- Base Hospital No. 41 collection, 1905/20091
- Baseball records, 1908/20242
- Bayly, Pierce, and Whitehair Families Genealogies, 20021
- Ben Benson Collection, 1789/20151
- Benjamin Huddle Diary, 1861/20062