- Le Keux, John
- Le Keux, John Henry
- Le Sueur, Xavier
- Leblanc
- Lechard
- Legrand, H.
- Leighton, Henry
- Leloir, Isidore
- Lemaître
- Leroux, A.
- Levié, Jacob (aka Adolphe Levié)
- Lewis, J.
- Leyat
- Lightfoot, Peter
- Ligny, Ad.
- Linton, Henry Duff
- Linton, William James
- Lion, Jules
- Louis, A.
- Loutrel, Victor
- Lowry, Joseph Wilson
- Lupton, Thomas Goff
- Lyouns, H. W.
- M. & N. Hanhart
- M. Murguia y Cía.
- Macbeth-Raeburn, Henry
- Maguire, Henry Calton
- Maile, George
- Manceau, Alexandre
- Mar, Léopold
- Marichal
- Marie, Alexandre Léon
- Marks, W.
- Marvy, Louis
- Massard, Léopold
- Matthis, Charles-Émile