- "Scenes from Behind the Wall: Images of East Germany, 1989/90" exhibit collection, 1989/201231
- 1x1 Japan Exhibition Materials, 1965-2024, 20243
- A. E. Dick Howard papers, 1928/2017124
- A. H. Hand Papers, 1835/20091
- A. Patrick L. Prest, Jr. papers, 1941/20149
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19661
- ALIVE (ALexandrians InVolved Ecumenically) Records (MS300), 1969/199516
- Abbye A. Gorin Architectural Collection, 1940/2006, bulk 1995/20061
- Abraham Anson papers, 1939/200550
- Academic Departments - Record Group 91
- Adagio Press Collection, 1957/19933
- Adam Empie Papers, 1811/2004, bulk 1811/18501
- Admiral Thomas J. Lopez Papers, 1973/201427
- Advisory Committee Research Collection, 1772/201711
- Agnes Wolf papers, 1966/20064