- Mansfield, Mike, 1903-20011
- March of Dimes1
- Marshall, F. Ray1
- McBeath, William H.1
- Menninger, Karl A. (Karl Augustus), 1893-19901
- Menominee Indian Tribe of Wisconsin1
- Merritt, T. Allen, 1946-1
- Mescalero Apache Tribe of the Mescalero Reservation, New Mexico1
- Modoc Indians1
- Modoc Tribe1
- Modoc Tribe of Oklahoma of Oklahoma1
- Moore, Arch A., Jr. (Arch Alfred), 1923-20151
- Muscogee (Creek) Nation1
- National Center for Medical Rehabilitation Research (U.S.)1
- National Council on U.S.-Arab Relations1
- Navajo Tribe of Arizona, New Mexico & Utah1
- Ojibwa Indians1
- Otoe-Missouria Tribe of Indians1
- Ponca Tribe of Indians of Oklahoma1
- Potawatomi Indians1
