- Armistead-Cocke Papers, 1680/19177
- Armstead L. Robinson papers, 1848/2001, bulk 1967/19927
- Armstrong Family Papers, 1853/19031
- Arnaud Preot Collection, 1841/18602
- Arthur I. Boreman Papers, 1830/194923
- Asa F. Horn Account Book and Family Correspondence, 1854/18611
- Ashcraft Family Genealogy, 1732/19721
- Association for the Preservation of Virginia Antiquities, Montgomery County Branch Papers, 1754/1996, bulk 1958/19832
- Assorted Monongalia County, West Virginia, Historical Documents, 1827/19491
- Athletics, 1830/20251
- Atkeson-Morgan Family Papers, 1833/1923, bulk 1850/190022
- Attorney's Account Book (Grayson and Wythe Counties, Va.), 1847/18592
- Aubrey E. Strode papers, 1861/19691
- Augusta County, Va. Merchant's Account Book, 1858/18602
- Augustus C. Golding Papers, 1859/1934, bulk 1862/18643