- B. J. Spruell Account Book, 1782/18362
- Baer Family Papers, 1744/19291
- Baird Family Papers, 1656/1922, bulk 1656/18483
- Baker Family Papers
1781-19216
- Bakers' Guild Bylaws and Register (Harburg, Germany), 1668/18091
- Barnes Family Papers, 1797/1926, bulk 1818/18751
- Barraud Family Papers, 1799/1904, bulk 1810/18601
- Barron Family Papers, 1793/19423
- Barry S. Martin collection of historical manuscripts and documents, 1771/18303
- Baylor Family Papers
1653-19156
- Bell, Kent, Cloyd, Withrow Family Collection, 1780/199813
- Ben Benson Collection, 1789/20151
- Benjamin Layman Papers, 1752/18152
- Benjamin Owen Tyler calligraphic manuscript and Fenno family papers, 1770/18161
- Benjamin Stoddert Ewell Papers, 1784/1934, bulk 1830/18923