- Kentucky State Medical Society.1
- Kitchen, J. M. W. (Joseph Moses Ward), 1846-19311
- Klotz, Hermann G. (Hermann Gustav), 1844-1928 compiler1
- Lamson, Mary Swift, 1822-19091
- Lange, J. Chris, 1847- author1
- Langley, Henry G., author1
- Langley, J., author1
- LeProhon, Ed. Ph., author1
- Lincoln, R. P. (Rufus Pratt), 1841-1900 author1
- Little, William S., author1
- Lloyd, Samuel, 1860-1926 author1
- Lobstein, J. F. Daniel (Johann Friedrich Daniel), 1777-18401
- McCaskey, G. W. (George Washington), 1853-1935 author1
- McCosh, A. J. (Andrew J.) author1
- McMurtry, L. S. (Lewis Samuel), 1850-1924 author1
- McVickar, John, 1787-18681
- Merriam, C. Hart (Clinton Hart), 1855-19421
- Metcalfe, John T. (John Thomas), -1902, author1
- Miller, Eli Peck, 1828-1912 author1
- Moll, Albert, 1862-1