- 1x1 Japan Exhibition Materials, 1965-2024, 20244
- A. E. Dick Howard papers, 1928/201722
- A. H. Hand Papers, 1835/20091
- A. Patrick L. Prest, Jr. papers, 1941/201417
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19661
- ALIVE (ALexandrians InVolved Ecumenically) Records (MS300), 1969/199513
- Abbye A. Gorin Architectural Collection, 1940/2006, bulk 1995/20061
- Abraham Anson papers, 1939/200511
- Academic Affairs: Academic Program Reviews, 1976/2018, bulk 1992/20181
- Adagio Press Collection, 1957/19933
- Adam Empie Papers, 1811/2004, bulk 1811/18501
- Administrative Management Society records, 1941/1987, bulk 1941/198742
- Admiral Thomas J. Lopez Papers, 1973/201413
- Advisory Committee Research Collection, 1772/201711
- African American Hugh Carr family, River View Farm, and the Papers of the Ivy Creek Foundation, 1916/19883