- Alpheus Garrison Civil War Records, 1804/18881
- Alphin Family Photographs, 1870/19301
- Alston Gordon Dayton Papers, 1846/19396
- Alston Gordon Dayton Papers, 1878/19201
- Alumni Association Records, 1833/2014, bulk 1950/20055
- Alumni and VMI certificates and citations collection, 1860/20134
- Amelia County, Va. Merchant's Account Book, 1852/1903, bulk 1852/18562
- American Civil War collection, 1860/18952
- American Flint Glass Workers Union Papers, 1878/19861
- American Missionary Society Papers, 1848/18821
- Amos Koontz Papers I, 1809/1965, bulk 1936/19651
- Amos Koontz Papers II, 1865/19704
- Anatole and Vladimir Kalichevsky Papers, 1871/19551
- Ancella Bickley, Historian, Research Papers regarding African-Americans, 1775/2018, bulk 1970/201138
- Anderson Family papers, 1755/195819