| Medhelan |
| Memorial |
| Metauro Edizioni |
| Mimesis |
| Minimum Fax |
| Mit Press |
| Mohr Siebeck |
| Mondadori |
| Mondadori Education |
| Morcelliana |
| Mosby |
| Mucchi |
| Mursia |
| Music Word Media Group |
| Naimi |
| Narcea |
| Nardini Editore |
| Nathan |
| Natural History Museum London |
| Navajivan Trust |
| Naval Institute Press |
| Neri Pozza |
| New Vessel Press |
| Newman Press |
| Nino Aragno |
| Nomos |
| Nottetempo |
| Nové Mesto |
| Oceanida |
| Odile Jacob |
| Officina Libraria |
| Oficyna Ingenium |
| Oficyna Naukowa |
| Ohio State University Press |
| Oikoymenh |
| Oldenbourg Verlag |
| Olschki |
| Omega |
| Open Gate Press |
| Orbis |