- Mason C. Andrews Papers, 1777/2010, bulk 1950/19901
- Mining Industry, 1000/20001
- Morley Jeffers Williams Collection, 1602/19673
- Morton Genealogy Collection, 1830/19784
- Museums at Washington and Lee records, 1649/20161
- Naval Account Book, 1660/17112
- Northern Neck Collection, 1672/19361
- Office of the President. James Blair Records, 1695/17473
- Ollen Lawrence Burnette, Jr. papers, 1815/20141
- Papers of the Low Moor Iron Company
1873-19271
- Paul G. Caplan Papers, 1890/20041
- Paul Stevens map collection, 1541/17781
- Performing arts manuscripts collection, 1475/19843
- Peter family papers, 1722/19322
- Randolph H. Lytton Historical Virginia collection, 1670/20043