| Machado Libros |
| Macmillan |
| Magisterio |
| Magowan |
| Marbot Ediciones |
| Marcianum Press |
| Marcus Edizioni |
| Marsilio |
| Masson |
| Matthes & Seitz Berlin |
| Max Niemeyer |
| McGill-Queen's University Press |
| McGraw-Hill |
| Memorial |
| Mimesis |
| Minimum Fax |
| Mit Press |
| Mohr Siebeck |
| Mondadori |
| Mondadori Education |
| Morcelliana |
| Mosby |
| Mursia |
| Music Word Media Group |