- Maury, William, 1799-18491
- Mayer, Alois1
- Mayhew, Experience, 1673-17581
- McCarron, Chas. R. (Charles R.), 1891-19191
- McConnell, Geo. B. (George Burnham), 1894-1982 1
- McDuffie, Sara1
- McIntosh, Lachlan, 1725-18061
- Medical College of South Carolina1
- Melville, Gideon1
- Merritt, James Harvey, 1755-18311
- Millikin, London, England1
- Moll, Herman (Geographer)1
- Moody, Eleanor1
- Morden, Robert, approximately 1650-17031
- Morgan, Carey, 1885-19601
- Nairne, Edward, 1726-18061
- National City Bank1
- Nelson, Ed G., 1885-1969 1
- New England Stationary Company1
- New-England Society1