- Amos Koontz Papers I, 1809/1965, bulk 1936/19651
- Amos Koontz Papers II, 1865/19708
- Anatole and Vladimir Kalichevsky Papers, 1871/19552
- Ann Kimberly Gifford Cunningham European Travel Diary, 1912/19131
- Anna Lou Jose Papers, 1905-1936, 1964, 1905/19641
- Anne T. Chapman Papers, 1884/19545
- Annie Baker Tucker's Colonial Ancestral Chart and Family Records, 1888/19191
- Anson Du Puy Van Buren letters, 1863/19971
- Appomattox Manor Music Collection, 1800/1940, bulk 1850/19101
- Armistead Family Papers, 1865/1946, bulk 1927/19293
- Armistead-Cocke Papers, 1680/19173
- Arthur George Williams Scrapbooks, 1905/19351
- Arthur W. and Leah James Scrapbooks, 1909/19772
- Association for the Preservation of Virginia Antiquities, Colonial Capitol Branch Records, 1896/19895
- August Sommer Diary, 1912/19132