- Anne Atkinson Chamberlayne Collection., 1742/19631
- Anne H. Cutler Papers, 1930/2013, bulk 1954/20001
- Anne Price Yates Papers II, 1898/20051
- Anne T. Chapman Papers, 1884/19541
- Appalachian Prints Collection, 1839/2010, bulk 1859/19092
- Archibald W. Campbell (1839-1899), Newspaperman, Papers, 1855/1941, bulk 1855/18991
- Architectural League of New York: Archive of Women in Architecture Records, 1892/19761
- Armistead Boothe Papers (MS164), 1803/19901
- Armistead-Cocke Papers, 1680/19171
- Arnold Sundgaard papers, 1925/19882
- Arthur "Bud" Metheny Papers, 1930/19911
- Arthur E. Scott photograph collection5
- Arthur I. Boreman Papers, 1830/19491
- Arthur M. Squires Papers, 1888/1987, bulk 1940/19871
- Asa Orin Bishop Papers, 1910/19902