Authors: 1919
- Larsson, Carl 1853-1919
- Lautensack, Heinrich 1881-1919
- Lee, James W. (James Wideman) 1849-1919
- Leino, Kasimir 1866-1919
- Levy, Louis Edward 1846-1919
- Liebknecht, Karl Paul August Friedrich 1871-1919
- Ljungberg, Eva 1850-1919
- Luxemburg, Rosa 1871-1919
- Macdonald, J. H. A. (John Hay Athole) 1836-1919
- MacGregor, William 1846-1919
- Mackenzie, J. B. 1851-1919
- Maclagan, Robert Craig 1839-1919
- Macy, Jesse 1842-1919
- Mahaffy, J. P. (John Pentland) 1839-1919
- Mainwaring, Cyril Lyttleton -1919
- Martínez, Emilio 1849-1919
- Matthews, William Henry 1919-
- McClung, Calvin Morgan 1855-1919
- Melin, Karl Alfred 1849-1919
- Mesquita, Marcelino 1856-1919
- Meyer, Kuno 1858-1919
- M'Govan, James 1845-1919
- Middlemass, Jean 1833-1919
- Monserdá de Maciá, Dolores 1845-1919
- Mooney, Jim (James Noel) 1919-2008
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