- M. Rupert Cutler Papers, 1930/2021, bulk 1962/2021186
- Machu Picchu Photography Prints and Brochure, 20111
- Maggie Anderson, Poet, Papers, 1958/2017, bulk 1980/201213
- Major General Kenneth D. Gray Papers, 1990/20251
- Malcolm Davis, Artist, Papers, 1970/20157
- Malcolm MacPherson Brownlee Civil War diary and transcription, 1862/20201
- Manuscripts Artifact Collection, 1800/20101
- Manuscripts Audiovisual Collection, 1920/20136
- Map Collection, 1629/19911
- Marat Moore Papers, 1978/20131
- Marc Harshman, Poet Laureate of West Virginia, Papers, 1970/202363
- Marching Royal Dukes Records, 1975/201637
- Margaret B. Ballard, Compiler, Monroe County Historical Papers and Other Material, 1783/2021, bulk 1910/19702
- Margaret M. Sullivan Collection, 1932/20113
- Margaret R. Thomas newsletters, 1970/20202