- McGovern, George S. (George Stanley), 1922-20121
- Menominee Indians15
- Miami Tribe of Oklahoma1
- Mollohan, Alan1
- Morton, Thruston B. (Thruston Ballard), 1907-19824
- Moser, Don1
- Moynihan, Daniel P. (Daniel Patrick), 1927-20034
- Murphy, Austin J.2
- Murphy, George, 1902-19923
- Murphy, Gordon1
- Muscogee (Creek) Nation, Oklahoma3
- Nakada, David1
- National Academy of Social Insurance (U.S.)1
- National Council of Senior Citizens1
- National Council of the Churches of Christ in the United States of America1
- National Republican Congressional Committee1
- Navajo Nation1
- Novak, Robert1
- Osage Tribe, Oklahoma1
- Ottawa Tribe of Oklahoma1
