- Losch, Abe, 1878-1937 1
- Losey, F. H. (Frank Hoyt), 1872-1931 1
- Luxton, J. 1
- Lynel, Vincent1
- MacDonald, C. W. 1
- MacPherson, Duncan E. 1
- Mahoney, Jack1
- Marr, Alex.1
- McCarron, Chas. R (Charles R.), 1891-1919 1
- McCarron, Chas. R. (Charles R.), 1891-1919 (composer/lyricist)1
- McConnell, Geo. B. (George Burnham), 1894-1982 1
- McConnell, J. Edwin 1
- McDonald, John D. 1
- McKenna, William J., 1881- 1
- McKenna, William J., 1881-1950 1
- McNaughton, Charles1
- Methven, Florence (composer)1
- Metropolitan Post Card Company1
- Meyer, George W. 1884-19591
- Mielzinger, Leo, 1869-19351