- Map Collection, 1629/19911
- Margaret Forbes Brand, Compiler, Genealogies, 1500/19651
- Margaret Grattan Weaver collection, 1707/1992, bulk 1857/19102
- Marshall W. Fishwick Collection, 1700/2007, bulk 1923/20072
- Mason C. Andrews Papers, 1777/2010, bulk 1950/19901
- Mercer County History, 1700/19351
- Methodist Files, 1784/20241
- Mills E. Godwin, Jr. Papers, 1712/1989, bulk 1947/19891
- Mining Industry, 1000/20001
- Morley Jeffers Williams Collection, 1602/19674
- Morton Genealogy Collection, 1830/19784
- Museums at Washington and Lee records, 1649/20161
- Myron Schmall Collection, 1711/18151
- Naval Account Book, 1660/17111
- Northern Neck Collection, 1672/19361