Collection
- M. Caldwell Butler Papers 1945-200652
- M. Rosaria Piomelli Architectural Collection3
- M. Thomas Inge papers8
- Mabel Harris Papers, 1888-19456
- Maggie Anderson, Poet, Papers11
- Major William Henry Johnson Papers 1884-1935344
- Malcolm Bell Papers1
- Manuscripts - Geographic Names, Business Names and Subjects45
- Manuscripts Artifact Collection194
- Manuscripts Audiovisual Collection132
- Marcia Feuerstein Architectural Collection10
- Marcia de Garmo Loudoun County Development Collection, 1933-2008, n.d.14
- Margaret (Peggy) Cochrane Architectural Collection,7
- Margaret B. Ballard, Compiler, Monroe County Historical Papers and Other Material7
- Margaret Freeman Cabell papers2