- 19th century newspaper illustrations collection, 1839/18941
- 19th century newspaper illustrations collection, 1861/18941
- Adele Goodman Clark papers, 1849/19781
- Admiral John Randolph Tucker Papers, 1865/18973
- Adolphus DeBussey, Soldier, Civil War Letters, 1861/1998, bulk 1861/18711
- Advisory Committee Research Collection, 1772/20174
- Alan Clarke Railroad Research Papers, 1861/20122
- Alexander Farish Robertson Papers, 1867/19311
- Alexander Haight family collection, 1764/19762
- Alexander Haight family collection, 1764/19775
- Alexandria History Collection (MS240), 1767/200817
- Alexandria Library Company Records (MS002), 1794/20075
- Allen Family Papers, 1766/19335
- Allen-Johnson Family Papers, 1838/19471
- Alumni Association Records, 1833/2014, bulk 1950/20052