- Livezey, Abraham, 1821-18961
- Logan, Thos. M. (Thomas Muldrup), 1808-18761
- London Medical Society of Observation.1
- Longshore, J. S. (Joseph Skelton), 1809-18791
- Louisville Medical Institute.1
- Löwig, Carl, 1803-18901
- Lugenbeel, J. W. (James Washington), 1819?-18571
- Mahony, O'Brien.1
- March, Alden, 1795-18691
- Marsh, S. N.1
- McCall, John, 1787-18671
- McGugin, D. L. (David L.), 1807-1865 author1
- McPheeters, William M. (William Marcellus), 1815-19051
- McVickar, J. A. (John Augustus), 1812-18921
- Medical Faculty of Pulaski County, Ark.1
- Meigs, Charles D. (Charles Delucena), 1792-18692
- Meigs, J. Forsyth (John Forsyth), 1818-18821
- Metcalf, J. W. (James W.)1
- Michel, Middleton, 1822-1894, author1
- Miller, James, 1812-18641