- M. Caldwell Butler Papers, 1945/20061
- M. Rupert Cutler Papers, 1930/2021, bulk 1962/2021177
- Madison E. Marye Papers, 1932/20073
- Maggie Anderson, Poet, Papers, 1958/2017, bulk 1980/201268
- Major General Kenneth D. Gray Papers, 1990/20251
- Malcolm Davis, Artist, Papers, 1970/201514
- Malcolm MacPherson Brownlee Civil War diary and transcription, 1862/20201
- Manuscripts Artifact Collection, 1800/20101
- Manuscripts Audiovisual Collection, 1920/201353
- Marc Harshman, Poet Laureate of West Virginia, Papers, 1970/202387
- Marching Royal Dukes Records, 1975/201644
- Marcia E. McDevitt papers44
- Marcus L. Oliver Correspondence, 1947/2010, bulk 1950/19855
- Margaret B. Ballard, Compiler, Monroe County Historical Papers and Other Material, 1783/2021, bulk 1910/19702
- Margaret M. Sullivan Collection, 1932/20112