- M. Caldwell Butler Papers, 1945/20061
- M. Rupert Cutler Papers, 1930/2021, bulk 1962/2021177
- MAGLEV Collection, 1999/20035
- Madison E. Marye Papers, 1932/20074
- Maggie Anderson, Poet, Papers, 1958/2017, bulk 1980/201269
- Major General Kenneth D. Gray Papers, 1990/20251
- Malcolm Davis, Artist, Papers, 1970/201511
- Malcolm MacPherson Brownlee Civil War diary and transcription, 1862/20201
- Manuscripts Artifact Collection, 1800/20105
- Manuscripts Audiovisual Collection, 1920/201329
- Marat Moore Papers, 1978/20131
- Marc Harshman, Poet Laureate of West Virginia, Papers, 1970/202383
- Marching Royal Dukes Records, 1975/201646
- Marcia E. McDevitt papers23
- Marcus L. Oliver Correspondence, 1947/2010, bulk 1950/19856