- M. Rupert Cutler Papers, 1930/2021, bulk 1962/2021122
- Macon and Joan Brock Virginia Health Sciences Marketing and Communications Records, 2018/20252
- Madeline Shaw papers, 2015/20193
- Major General Kenneth D. Gray Papers, 1990/20251
- Malcolm MacPherson Brownlee Civil War diary and transcription, 1862/20201
- Marc Harshman, Poet Laureate of West Virginia, Papers, 1970/202355
- Margaret B. Ballard, Compiler, Monroe County Historical Papers and Other Material, 1783/2021, bulk 1910/19702
- Margaret M. MacGill Genealogy Collection (MS254), 20181
- Margaret R. Thomas newsletters, 1970/20202
- Marsha Polier Artist Archives (VA-13), 1968/20234
- Martin Luther King, Jr. Day Community Parade posters, 2017/20222
- Mary Walton Livingston papers, 20182
- Mattachine Society of Washington D.C. records, 1942/202014
- Max Hayslette, Artist, Papers and Artwork, 1927/20192
- McLeod Tyler Wellness Center records, 20183