- 1x1 Japan Exhibition Materials, 1965-2024, 20241
- A. E. Dick Howard papers on the Virginia Commission on Constitutional Revision, 1968/19712
- A. E. Dick Howard papers, 1928/201710
- A. H. Hand Papers, 1835/20091
- A. Jane Duncombe Architectural Papers, 1952/20021
- A. Patrick L. Prest, Jr. papers, 1941/201422
- A. Rufus Tonelson Papers, 1922/19751
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19662
- ALIVE (ALexandrians InVolved Ecumenically) Records (MS300), 1969/19955
- Abbye A. Gorin Architectural Collection, 1940/2006, bulk 1995/20061
- Abraham Anson papers, 1939/200542
- Academic Departments - Record Group 91
- Adagio Press Collection, 1957/19935
- Adalbert J. Volck Collection of Etchings, 1861/19793
- Adam Empie Papers, 1811/2004, bulk 1811/18502