- Alpheus Garrison Civil War Records, 1804/18881
- Alston Gordon Dayton Papers, 1846/19392
- Alumni Association Records, 1833/2014, bulk 1950/20055
- Ambrotype Portrait Photograph of Mrs. Josephine Neal Robb in Case, 1850/18701
- Amelia County, Va. Merchant's Account Book, 1852/1903, bulk 1852/18562
- American Missionary Society Papers, 1848/18821
- Amos Johnson Ledgers, 1808/1861, bulk 1808/18211
- Amos Koontz Papers I, 1809/1965, bulk 1936/19652
- Ancella Bickley, Historian, Research Papers regarding African-Americans, 1775/2018, bulk 1970/201127
- Anderson Family papers, 1755/195819
- Andrew Delmar Hopkins Papers, 1787/19431
- Andrew Jackson Davis Collection, 1840/20112
- Andrew Kerr Account Book, 1852/18561
- Andrew Nelson Campbell Papers, 1854/19281
- Andrew S. Core, Typescripts and Charts, 1804/18881