- 19th Century Virginia albumen photographs, 1880/18991
- 19th century newspaper illustrations collection, 1839/18941
- 19th century newspaper illustrations collection, 1861/18941
- Acker Family Diaries, 1880/19062
- Adele Goodman Clark papers, 1849/19781
- Admiral John Randolph Tucker Papers, 1865/18971
- Adolphus DeBussey, Soldier, Civil War Letters, 1861/1998, bulk 1861/18711
- Alan Clarke Railroad Research Papers, 1861/20124
- Albert Blakeslee White (1856-1941) Papers, 1888/19291
- Alexander Farish Robertson Papers, 1867/19313
- Alexander Haight family collection, 1764/19762
- Alexander Haight family collection, 1764/19775
- Alexandria History Collection (MS240), 1767/200818
- Alexandria Library Company Records (MS002), 1794/20073
- Alleghany Chapter, National Society of the Daughters of the American Revolution Records,, 1890/20221