- Mame Warren collection, 1997/19991
- Maps, 1890/19502
- Mark Byrn Davis, Jr. Correspondence, 19841
- Mary Lee Bowman collection, 1868/19231
- Mary Paxton Barclay Papers, 1938/19511
- Maryland Historical Society statement of appreciation for John H. Latane, 19321
- Matriculation Books, 1805/19711
- McCormick Family Collection, 1914/19631
- Melvin Horton Kempton diploma, 19321
- Milton J. Elliott, IV Collection, 1950/19561
- Milton W. Humphreys Autobiography, 1860/18751
- Murray F. Smith certificates, 18681
- Museums at Washington and Lee records, 1649/20166