- Augustus C. Golding Papers, 1859/1934, bulk 1862/18641
- Baker Family Papers, 1805/19111
- Bark Lorena Ship Records, 1860/18711
- Barker-Cooke Papers, 1809/1889, bulk 1848/18661
- Barron Family Papers, 1793/19421
- Baytop-Fitzhugh Papers, 1840/18661
- Bell Hospital Records, 1926/19701
- Benefactions of Francis Nicholson, Esqr. to the Church & Clergy in North America, 1689/17041
- Benjamin Layman Papers, 1752/18151
- Benjamin Stoddert Ewell Papers, 1784/1934, bulk 1830/18921
- Blair, Banister, Braxton, Horner, Whiting Papers, 1760/1890, bulk 1765/18171
- Blakemore Papers, 1830/18891
- Blow Family Papers, 1613/1960, bulk 1770/18751
- Blue Star Mothers of America Records, 1956/19661
- Boelt Family Papers, 1948/19751