- A. Willis Robertson Papers, 1921/1988, bulk 1946/19661
- Alabama Collection, 1823/18931
- Alexander Brown Papers (I), 1815/19101
- Alexander M. Davis Papers, 1850/18921
- Alpha Delta Gamma Records, 1993/20121
- Alumni Band Organization Records, 1986/2012, bulk 1986/20001
- American Association of University Professors, College of William and Mary Chapter Records, 1924/1979, bulk 1924/19791
- Andrew Johnson Check, 18681
- Andrew Lindamood papers, 1768/18171
- Anne H. Cutler Papers, 1930/2013, bulk 1954/20001
- Archibald Woods Papers, 1777/1846, bulk 1783/18461
- Armistead-Cocke Papers, 1680/19171
- Armstrong Family Papers, 1853/19031
- Art Song of Williamsburg Records, 2000/20071
- Association for the Preservation of Virginia Antiquities, Colonial Capitol Branch Records, 1896/19891