| Mairie de Castres / Imprimerie J. Mas | France | 1 |
| Maison Boligrafo | France | 1 |
| Maison d'Ennour | | 4 |
| Maison de l'Orient et de la Méditerranée | | 6 |
| Maison des Langues | France | 6 |
| Maison du Bon Livre / Oeuvres de Saint-Charles | France | 1 |
| Maison du patrimoine médiéval mosan (MPMM) | France | 1 |
| Maison Eliza | | 31 |
| Maison Georges | France | 6 |
| Maison Pop | France | 5 |
| Maison Quantin | France | 3 |
| Maison Rose | Canada | 8 |
| Maisonneuve | France | 6 |
| Maisonneuve & Larose | France | 23 |
| Makaka | France | 99 |
| Make Believe Ideas | | 1 |
| Makisapa | France | 4 |
| Malas Tierras | Espagne | 1 |
| Malo Quirvane | France | 1 |
| Maloine | France | 15 |
| Malpertuis | France | 33 |
| Malugui | | 1 |
| Malysa | | 11 |
| Mama | France | 86 |
| Mama Josefa | France | 3 |
| Mamamélis | | 6 |
| Mame | France | 161 |
| Mame-Edifa | France | 21 |
| Mammoth | France | 4 |
| Mammouth Rose | | 1 |
| Man | | 3 |
| Mana books | France | 385 |
| Manannan | France | 4 |
| Manchester University Press | | 8 |
| Mandarin | France | 7 |
| Manderley Press | | 2 |
| Mané Huily | France | 1 |
| ManEd | France | 34 |
| Manesse | Allemagne | 1 |
| Manga Classics | | 1 |
| Manga-news | | 9 |
| Mangaline | France | 13 |
| Mangaplayer | France | 27 |
| Mangas.io | France | 2 |
| Mangavelle | France | 3 |
| Mangeclous | France | 3 |
| Mangetsu | France | 345 |
| Mango | France | 647 |
| Mango Publishing | Etats-Unis | 2 |
| Manhattan | Allemagne | 2 |
| Manifeste! | France | 5 |
| Manilla Press | Angleterre | 22 |
| Manise | France | 7 |
| Manitoba / Les Belles Lettres | France | 12 |
| Manning | Etats-Unis | 1 |
| Manolosanctis | France | 23 |
| Mänpocket | Suède | 11 |
| Manteau | France | 9 |
| Mantle | Etats-Unis | 31 |
| Manucius | | 20 |
| Manuella | France | 6 |
| Many monsters | | 1 |
| Manya | | 2 |
| ManyBooks.net | France | 1 |
| Marabout | France | 2604 |
| Marais | France | 2 |
| Marais fils aîné | | 1 |
| Marathon | | 82 |
| Marbre | France | 2 |
| Marc Minoustchine | France | 1 |
| Marcel Broquet | France | 22 |
| Marcel et Joachim | | 37 |
| Marchand de feuilles | France | 58 |
| Marchialy | France | 67 |
| Marco Pietteur | Belgique | 2 |
| Marcos y Marcos | Italie | 1 |
| Mardaga | Belgique | 87 |
| Mare & Martin | | 5 |
| Mare et Martin | | 2 |
| Mare Nostrum | France | 7 |
| Maréchal | | 2 |
| Marée Haute | France | 6 |
| Maren Sell | France | 19 |
| Marest | | 9 |
| Mareuil | | 56 |
| Margaret Comics | Japon | 7 |
| Margaret K. McElderry Books | | 103 |
| Margot | | 54 |
| Marguerite Waknine | | 7 |
| Marie B | France | 3 |
| Marie Barbier | | 6 |
| Marie Claire | France | 49 |
| Marie de Nazareth | France | 1 |
| Marie-Louise | France | 7 |
| Mariner Books | Etats-Unis | 159 |
| Marines | France | 10 |
| Marines et d'Outre-Mer | France | 1 |
| Mario Mella | | 1 |
| Marion Loyds Book | France | 3 |
| Marion Zimmer Bradley Literary Works Trust | | 2 |
