- A. J. Davis Family Collection, 1874/2007, bulk 1874/19076
- Adam Finch Collection, 1891/19332
- Adam T. Finch Papers, 1895/19262
- Adin B. Underwood Papers, 1861/19262
- Albert L. Sturm Papers, 1904/19883
- Alexander Farish Robertson Papers, 1867/193138
- Alexander McNutt Glasgow Family Papers, 1823/19031
- Alexander W. Brown Diaries, 1904/19212
- Alleghany Chapter, National Society of the Daughters of the American Revolution Records, 1890/20224
- Ambrose L. Snavely Papers, 1903/19522
- American Locomotive Company/Baldwin Locomotive Works Illustrations, 1900/19251
- Ann A. Hertzler Collection, 1863/2013, bulk 1974/20002
- Ann Eve Moss Papers, 1920/19901
- Anna Burton Ellett Collection, 1751/19321
- Anne H. Price Yates Papers, 1904/1985, bulk 1975/19852