- Lopez, Antonio, active 1833, author1
- Lopez, José Antonio, active 1833, author1
- Louis, P. C. A. (Pierre Charles Alexandre), 1787-18721
- Lusk, William Thompson, 1838-1897, author1
- Magariños Cervantes, Alejandro, 1825-1893, author1
- Massachusetts Medical Society.1
- McClellan, Ely, 1834-1893, author1
- Medical Society of the County of New York.1
- Mendonça, Joaquim Jacintho de.1
- Mexico City (Mexico). Ayuntamiento, author.1
- Miner, Thomas, 1777-18411
- Minor, Thomas C. (Thomas Chalmers), 1846 or 1847-19121
- Mobile (Ala.). Committee on Causes and Extent of the Late Extraordinary Sickness and Mortality in the Town.1
- Monette, John W. (John Wesley), 1803-18511
- Montevideo (Uruguay). Junta Económico-administrativa, author.1
- Moreno, Ignacio, author1
- Morris, Moreau, 1825-1904, author1
- Murtough, Peter.1
- New Orleans (La.). Sanitary Commission.1
- Nicholson, Thomas.1