- A. E. Dick Howard papers, 1928/20171
- A. H. Hand Papers, 1835/20091
- A. J. Davis Family Collection, 1874/2007, bulk 1874/19076
- A. K. Leake Papers, 1872/19401
- A. Rufus Tonelson Papers, 1922/19751
- A. S. Lara papers, 1856/18611
- A. Willis Robertson Papers, 1921/1988, bulk 1946/196610
- Abraham Anson papers, 1939/20052
- Ackerly Family Papers1
- Adalbert J. Volck Collection of Etchings, 1861/19793
- Adam Empie Papers, 1811/2004, bulk 1811/18502
- Adam Finch Collection, 1891/19331
- Adam T. Finch Papers, 1895/19261
- Adams T. Rice papers, 1922/19606
- Addison H. Smith papers, 1917/1970, bulk 1917/19224