- McCarthy, Joseph, 1908-19571
- McCormick, Stephen (Stephen J.), 1914-20121
- McHugh, M. L. (Matthew Lee), 1899-19851
- Mundt, Karl E. (Karl Earl), 1900-19741
- Mutual Broadcasting System1
- National Gallery of Art (U.S.)1
- National Science Foundation (U.S.)1
- National Temperance League (U.S.)1
- Natural gas1
- New York Southern Society1
- Newberry Electric Cooperative1
- Newspapers1
- Nuclear energy1
- Oats1
- Pee Dee Electric Cooperative1
- Peurifoy, John E. (John Emil), 1907-19551
- Plotkin, Harry Morris, 1913-19981
- Port Royal (S.C.)1
- Presidents1
- Public housing1