- Masonic Research Society of West Virginia.1
- Masontown United Methodist Church (Masontown, W. Va.)1
- Massachusetts Historical Society.2
- Master Glass Company (Clarksburg, W. Va.)2
- Master Marble Company (Clarksburg, W. Va.)1
- Mates Creek District Primitive Baptist Association (Ky.)1
- Matewan Development Center (W. Va.)1
- Matheny, H. E.1
- Mather, Joseph V.1
- Mathews, Henry Mason, 1834-1884.2
- Mathews, William Gordon.1
- Mathur, Raghubir Sahai, 1912-2
- Maurer, Beryl Blake, 1920-4
- Maury, M. F. (Matthew Fontaine), 1849-1886.1
- Maury, Matthew Fontaine, 1806-1873.1
- Maxon, William R.1
- Maxwell, Cyrus H. 1
- Maxwell, Hu, 1860-1927.8
- Maxwell, John A.1
- Maxwell, John.1
