- A. Willis Robertson Papers, 1921/1988, bulk 1946/19662
- ALIVE (ALexandrians InVolved Ecumenically) Records (MS300), 1969/199512
- Abbye A. Gorin Architectural Collection, 1940/2006, bulk 1995/20062
- Abraham Anson papers, 1939/200526
- Academic Affairs: Academic Program Reviews, 1976/2018, bulk 1992/20181
- Adagio Press Collection, 1957/19935
- Adam Empie Papers, 1811/2004, bulk 1811/18502
- Additional Louis J. Halle, Jr. Papers
1938-19875
- Adele Goodman Clark papers, 1849/19783
- Administrative Management Society records, 1941/1987, bulk 1941/19871
- Admiral John Randolph Tucker Papers, 1865/18971
- Admiral Thomas J. Lopez Papers, 1973/201411
- Admissions Office student recruitment materials, 1950/20191
- Adolphus DeBussey, Soldier, Civil War Letters, 1861/1998, bulk 1861/18711
- Advisory Committee Research Collection, 1772/201715