- M. Caldwell Butler Papers, 1945/20061
- M. Rosaria Piomelli Architectural Collection, 1960/199514
- M. Rupert Cutler Papers, 1930/2021, bulk 1962/202159
- M. Thomas Inge papers, 1879/20013
- Mabel Hoggard, Educator, Papers, 1924/1989, bulk 1932/19891
- Maddex Family Papers, 1937/20001
- Madison E. Marye Papers, 1932/20076
- Madison Institute for Interdisciplinary Studies records, 1984/19933
- Maggie Anderson, Poet, Papers, 1958/2017, bulk 1980/201272
- Making of Virginia Architecture Collection, 1988/19943
- Malcolm Davis, Artist, Papers, 1970/201511
- Malcolm MacPherson Brownlee Civil War diary and transcription, 1862/20201
- Manuscripts Artifact Collection, 1800/20106
- Manuscripts Audiovisual Collection, 1920/201315
- Map Collection, 1629/19911