- Admiral John Randolph Tucker Papers, 1865/18971
- Advisory Committee Research Collection, 1772/20173
- Alexander Haight family collection, 1764/19761
- Alexander Haight family collection, 1764/19771
- Alexandria History Collection (MS240), 1767/20087
- Alexandria Library Company Records (MS002), 1794/20073
- Allen Family Papers, 1766/19331
- Ancella Bickley, Historian, Research Papers regarding African-Americans, 1775/2018, bulk 1970/20111
- Anna Burton Ellett Collection, 1751/19321
- Armistead-Cocke Papers, 1680/19172
- Association for the Preservation of Virginia Antiquities, Montgomery County Branch Papers, 1754/1996, bulk 1958/19831
- Austin-Twyman Papers, 1765/19392
- Barron Family Papers, 1793/19421
- Barry S. Martin collection of historical manuscripts and documents, 1771/18301
- Bell, Kent, Cloyd, Withrow Family Collection, 1780/19982