- Lawrence Water Cure and Hotel (Brattleboro, Vt.), author.1
- Lee, Charles A. (Charles Alfred), 1801-18721
- Leidy, Joseph, 1823-18911
- Leubuscher, Rud. (Rudolph), 1821-18611
- 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, J. Forsyth (John Forsyth), 1818-18821