- Malcolm Davis, Artist, Papers14
- Margaret Hoffman Collection, 1893-19699
- Marian McQuade Papers2
- Marshall W. Fishwick Collection12
- Martin Judy Family Papers10
- Martin Luther Brown, Warden, Moundsville Penitentiary Records2
- Mary McKendree Johnson, Collector, Papers11
- Matthew Mansfield Neely (1874-1958), Politician, Papers28
- Melvin C. Snyder, Congressman, Papers4
- Metropolitan Theatre, Morgantown, Records207
- Mildred Hassler Layman, Family and Genealogy Papers1
- Monongalia County (W. Va.) Court Records and Miscellaneous Papers918
- Monongalia County Historical Records170
- Morgan County Court Records59
- Morgantown Municipal Records14