- Administration records collection, 1776/197611
- Admiral John Randolph Tucker Papers, 1865/18972
- Adolphus P. Howard Papers, 1850/19381
- Adolphus P. Howard Papers, 1854/19041
- African American Stereoview Collection, 1860/19012
- African and African American photograph collection, 1850/19451
- Aileen Shafer, Collector, Material regarding African-Americans, 1829/18845
- Alabama Collection, 1823/18932
- Albert Frederick Wilson papers, 1840/19343
- Albert R. Gallatin papers, 1795/18281
- Albert Taylor Bledsoe and Sophia Bledsoe Herrick letters, 1858/19081
- Alderman family papers, 1779/19616
- Alexander Brown Papers (I), 1815/191016
- Alexander Brown Papers (II), 1748/19008
- Alexander Craig Letter, 18602