- M. Sarrablo y Clavero (Paris) (1)
- M. Witmark & Sons (New York), 1917 (1)
- M. Witmark & Sons (New York), 1937 (1)
- M.I. Weller (Washington?), 1901 (1)
- M.W. Taylor and W.C. Echols (Cincinnati) (1)
- MacGibbon and Kee (London), 1969 (1)
- MacMillan (New York), 1977 (1)
- Macaulay Co. (New York) (1)
- Maclear & Co., Liths (Toronto) (1)
- Macmillan (New York), 1926 (1)
- Macmillan Co (New York) (1)
- Macoy Publishing and Masonic Supply Co (New York) (1)
- Macrae Smith (Philadelphia) (2)
- Madeira (5)
- Madison AIDS Support Network (1)
- Madison Association of Commerce (Madison, Wis) (1)
- Maggs Bros. Ltd. (London) (9)
- Magill-Weinsheimer Co. (1)
- Mahely-Lamy (Berne) (1)
- Maison Andriveau Goujon (1894-1900) (29)
