- Addison H. Smith papers, 1917/1970, bulk 1917/19223
- Adele Blow Chatfield-Taylor family papers, 1899/197723
- Administration records collection, 1776/19764
- Advisory Committee Research Collection, 1772/201712
- African American Family Photographs, 1880/19603
- African American Family photograph album, 1910/19601
- African American Hugh Carr family, River View Farm, and the Papers of the Ivy Creek Foundation, 1916/19881
- Agnes Mason Price papers, 1930/19352
- Albert Frederick Wilson papers, 1840/19342
- Albert J. Wasserman Papers, 1925/20032
- Albert L. Sturm Papers, 1904/19884
- Albert M. Brown Collection, 1930/19381
- Albert Moore Reese, Zoology Professor, Miscellaneous Items, 1900/19706
- Albert R. Gallatin papers, 1795/18281
- Alberta Pfeiffer Architectural Collection, 1929/19761