- Maginot, André, 1877-1932.1
- Maier, William J. (William Joseph), 1903-1
- Marching bands.1
- May Day (Labor holiday)1
- Mayors.1
- McAdoo, W. G. (William Gibbs), 1863-1941.1
- McKellar, Kenneth Douglas, 1869-1957.1
- Mellon, Andrew W. (Andrew William), 1855-1937.1
- Memorial rites and ceremonies.1
- Memorials.1
- Merriam, Frank Finley, 1865-1955.1
- Military ceremonies, honors, and salutes.1
- Millerand, Alexandre, 1859-1943.1
- Monuments.1
- Moore, Arthur Harry, 1879-1952.1
- Motion picture theaters--Washington (D.C.)1
- Motion pictures--United States.1
- Motorcades.1
- Mountbatten family.1
- National Theatre (Washington, D.C.)1