- Ammen L. Burger, Jr. collection, 1917/19601
- Amos Koontz Papers I, 1809/1965, bulk 1936/19651
- Amos Koontz Papers II, 1865/19701
- Anatole and Vladimir Kalichevsky Papers, 1871/19551
- Anderson Family papers, 1755/19581
- Andrew C. L. Gatewood papers, 1860/19931
- Ann Norvell Otey Scott Papers, 1920/19481
- Anne T. Chapman Papers, 1884/19541
- Anson Du Puy Van Buren letters, 1863/19971
- Archibald F. Ward, Jr. Papers, 1939/2007, bulk 1945/19601
- Armand J. Galfo Papers, 1940/2008, bulk 1958/19951
- Armistead Boothe Papers (MS164), 1803/19901
- Arnold Goldman Living Newspaper collection, 1931/19731
- Association for the Preservation of Virginia Antiquities, Colonial Capitol Branch Records, 1896/19891
- Association for the Preservation of Virginia Antiquities, Yorktown Branch Records, 1921/2013, bulk 1975/20051