- A. Willis Robertson Papers, 1921/1988, bulk 1946/19664
- ALIVE (ALexandrians InVolved Ecumenically) Records (MS300), 1969/199510
- Abbye A. Gorin Architectural Collection, 1940/2006, bulk 1995/20062
- Abraham Anson papers, 1939/200532
- Academic Affairs: Academic Program Reviews, 1976/2018, bulk 1992/20181
- Ackerly Family Papers3
- Adagio Press Collection, 1957/19936
- Adalbert J. Volck Collection of Etchings, 1861/19794
- Adam Empie Papers, 1811/2004, bulk 1811/18503
- Adam and Anna Barbara Rader Family (Timberville, Va.) Genealogy, 19781
- Addison H. Smith papers, 1917/1970, bulk 1917/19221
- Additional Louis J. Halle, Jr. Papers
1938-19877
- Adele Goodman Clark papers, 1849/19785
- Administrative Management Society records, 1941/1987, bulk 1941/19871
- Admiral Thomas J. Lopez Papers, 1973/20145