Authors: R.
- Locke, David Ross 1833-1888
- Lodge, R. B. (Reginald B.) 1852-1936
- Lohse, W. R. 1890-1969
- Long, R. E. C. (Robert Edward Crozier) 1872-
- Long, William A. R. Jex -
- Loomis, Allen R. -
- Loomis, Justin R. (Justin Rudolph) 1810-1898
- Lord, Robert Howard 1885-1954
- Los Rios, R. de (Ricardo) 1846-1929
- Love, Harold 1937-2007
- Lucas, Lex R. -
- Lull, Richard Swann 1867-1957
- Lundie, R. H. (Robert Henry) 1824-1885
- Lunt, Theodore R. W. 1878-1951
- Lutz, R. R. (Rufus Rolla) 1873-
- Lydekker, Richard 1849-1915
- Lyman, Richard Roswell 1870-1963
- Lyttelton, R. H. (Robert Henry) 1854-1939
- Maag, Carl R. -
- Macalister, Robert Alexander Stewart 1870-1950
- MacArthur, Robert Stuart 1841-1923
- Macaulay, Rose 1881-1958
- Macauley, C. R. (Charles Raymond) 1871-1934
- MacBeth, R. G. (Roderick George) 1858-1934
- Macduff, John R. (John Ross) 1818-1895
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