- Meigs, J. Forsyth (John Forsyth), 1818-18824
- Merriam, C. Hart (Clinton Hart), 1855-1942, author4
- Mettler, L. Harrison (Lee Harrison), 1863-1939, author4
- Mitchell, Clifford, 1854-1939, author4
- Mohr, Charles, 1844-1907, author4
- Morris, Henry, 1855-19294
- Morris, Moreau, 1825-19044
- Morton, Samuel George, 1799-18514
- Morton, Thomas G. (Thomas George), 1835-1903, author4
- Morton, W. T. G. (William Thomas Green), 1819-18684
- Morton, William J. (William James), 1846-19204
- Mutual Benefit Life Insurance Company, author.4
- Nancrede, Charles B. (Charles Beylard), 1847-19214
- Nancrede, Charles B. (Charles Beylard), 1847-1921, author4
- Neidhard, C. (Charles), 1809-18954
- New York Dispensary, author.4
- New York Hospital. Library.4
- Newberry, J. S. (John Strong), 1822-18924
- Newell, Otis K. (Otis Kimball), 1860- author4
- Newton, William K., author4