- Mayflower (Yacht)2
- Mayo, Charles Horace, 1865-1939.2
- Mayors.2
- McKellar, Kenneth Douglas, 1869-1957.2
- Meetings.2
- Memorial rites and ceremonies.2
- Men.2
- Metal castings.2
- Military art and science.2
- Mitchell, William D. (William De Witt), 1874-1955.2
- Money supply.2
- Morrow, Dwight W. (Dwight Whitney), 1873-1931.2
- Motorboat racing.2
- Motorboats.2
- Musicians.2
- National Broadcasting Company.2
- National Geographic Society (U.S.)2
- Naval art and science.2
- New, Harry S. (Harry Stewart), 1858-1937.2
- Northwest Airlines, inc.2