- A. Willis Robertson Papers, 1921/1988, bulk 1946/19661
- AEOC Society Minute Book, 1832/18371
- Abner Johnson Leavenworth Papers, 1825/18611
- Abraham Grove Account Book, 1815/18501
- Adam Empie Papers, 1811/2004, bulk 1811/18501
- Adam Rinica and George Rinica Account Book, 1822/18481
- Adams Papers, 1782/18901
- Addie Rogers Bound Sheet Music Collection, 1827/18602
- Alabama Collection, 1823/18931
- Alexander Brown Papers (I), 1815/19102
- Alexander Hamilton, Jr. Letters, 1832/18331
- Alumni Association Records, 1833/2014, bulk 1950/20051
- Ambler Papers, 1806/18361
- Ambrose H. White Letter Book, 1828/18341
- Andrew Reid Account Book, 1787/18371