- Anna Burton Ellett Collection, 1751/19326
- Anna P. Sokolina Architectural Collection, 1924/20192
- Anne H. Price Yates Papers, 1904/1985, bulk 1975/19852
- Anne Price Yates Papers II, 1898/20054
- Annie M. Hale Sheet Music Collection, 1892/19871
- Antoine Gaujot and Julien E. Gaujot Papers, 1840/19995
- Appalachian Electric Power Company Photographs, 1931/19562
- Appomattox Iron Works and Supply Company Records, 1925/19394
- Archer Lawrie Sheet Music Collection, 1879/19352
- Architectural League of New York: Archive of Women in Architecture Records, 1892/19763
- Armed Services Edition Collection, 1913/19451
- Arthur B. Massey Papers, 1902/19615
- Arthur M. Squires Papers, 1888/1987, bulk 1940/198740
- Arthur W. Grove Family Papers,, 1900/19572
- Association for Women in Architecture Records, 1928/19925