- 30 Mailboxes
- 577 Main Building
- 6 Main Reading Room
- 2 Main Stairway
- 2 Main Street
- 3 Maine
- 3 Maintenance
- 1 Maintenance men
- 1 Major, J. R. (John Richardson), 1797-1876
- 6 Majority
- 1 Makart, Hans, 1840-1884.
- 1 Make-dos
- 1 Malachi (Biblical prophet)
- 1 Malaga, New Jersey
- 1 Malaysia
- 4 Malchus (Biblical figure)
- 1 Malcolm & Stevenson
- 1 Maldarelli, Federico
- 1 Maldarelli, Federico.
- 2 Male figure drawings
- 4 Malfatti, Andrea, 1832-1917.
- 1 Malicon Point
- 1 Mallets
- 2 Mallorca, Spain
- 6 Mallory, Wheeler & Co.
- 2 Malt industry
- 2 Malta
- 3 Malvern Avenue
- 1 Malvern Hill, Virginia
- 95 Mammals
- 1 Mammoth Hot Springs
- 4 Mammoths
- 1 Management
- 1 Managers
- 1 Manassas National Battlefield Park, Virginia
- 1 Manassas, Virginia
- 2 Manatawna Avenue
- 1 Manatawna Farm
- 3 Manatawna School
- 122 Manayunk
