- Alabama Collection, 1823/18931
- Alderman family papers, 1779/19611
- Alexander Brown Papers (I), 1815/19101
- Alexander Brown Papers (II), 1748/19001
- Alexander Haight family collection, 1764/19761
- Alexander McNutt Glasgow Family Papers, 1823/19031
- Alexander, Fultz, and Willson Families Collection, 1770/19701
- Alexandria History Collection (MS240), 1767/20081
- Alexandria Library Company Records (MS002), 1794/20071
- Alexandria Scrapbook Collection (MS003), 1830/18931
- Alexandria, Virginia City Records (MS019), 1750/1983, bulk 1825/18751
- Alfred Leyburn Papers, 1823/1899, bulk 1830/18391
- Alice Rice Jaffe Papers, 1807/1950, bulk 1919/19501
- Allen Family Papers, 1766/19331
- Alpheus Garrison Civil War Records, 1804/18881