| Lyrical Press | Etats-Unis | 15 |
| Lys | | 2 |
| Lysons | | 3 |
| L’Idée bleue | France | 1 |
| M+ | France | 128 |
| M. E. Sharpe | | 2 |
| M.C.L. | France | 6 |
| M.E.C | France | 22 |
| M.E.O. | France | 9 |
| M21 | France | 2 |
| M6 | France | 24 |
| MA | France | 61 |
| MA Editions | France | 1 |
| Mac Guffin | France | 2 |
| Macabre | Suisse | 2 |
| MacAdam/Cage | Etats-Unis | 4 |
| Macdonald | France | 3 |
| Macha Publishing | France | 31 |
| Mâche Milo | | 1 |
| Machine Intelligence Research Institute | | 2 |
| MacLehose Press | | 17 |
| MacMay | France | 7 |
| Macmillan | Angleterre | 629 |
| Macmillan Collector's Library | Etats-Unis | 15 |
| Maçonniques de France | | 5 |
| Macro | | 23 |
| Macula | | 7 |
| Mad Cave Studios | Etats-Unis | 12 |
| Mad Fabrik | France | 19 |
| Mad Norwegian Press | | 2 |
| Mademoiselle a trois ailes | | 9 |
| Madrépores | | 2 |
| maelstrÖm | France | 51 |
| Maëster | France | 1 |
| Maeva | | 10 |
| Mag Garden | Japon | 19 |
| Mag Mell Publishing | | 1 |
| Magabala Books | | 3 |
| Mage | France | 26 |
| Magellan | France | 20 |
| Magellan & Cie | France | 88 |
| Magellan & Cie / Courrier International | France | 13 |
| Magellan & Cie / Elyzad / Courrier International | France | 1 |
| Magenta | France | 2 |
| Maggi | France | 1 |
| Magic Dome Books | | 6 |
| Magic Mirror | France | 43 |
| Magic Strip | France | 12 |
| Magic Tales | France | 2 |
| Mägika | | 20 |
| Magnani | | 24 |
| Magnard | France | 741 |
| Magnetic Press | Etats-Unis | 5 |
| Magnificat | France | 3 |
| Magnum books | Angleterre | 2 |
| Magnus | France | 24 |
| Magpie Books | France | 34 |
| MAHO | France | 2 |
| Mahô | France | 56 |
| Maïa | | 113 |
| Mains libres | Canada | 18 |
| Mainstream Publishing | France | 4 |
| 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 | 2 |
| Maison Quantin | France | 3 |
| Maison Rose | Canada | 8 |
| Maisonneuve | France | 6 |
| Maisonneuve & Larose | France | 23 |
| Makaka | France | 97 |
| Make Believe Ideas | | 1 |
| Makisapa | France | 4 |
| Malo Quirvane | France | 1 |
| Maloine | France | 15 |
| Malpertuis | France | 33 |
| Malugui | | 1 |
| Malysa | | 11 |
| Mama | France | 84 |
| Mama Josefa | France | 3 |
| Mamamélis | | 6 |
| Mame | France | 160 |
| Mame-Edifa | France | 21 |
| Mammoth | France | 4 |
| Mammouth Rose | | 1 |
| Man | | 3 |
| Mana books | France | 373 |
| Manannan | France | 3 |
| Manchester University Press | | 8 |
| Mandarin | France | 7 |
| Manderley Press | | 2 |
| Mané Huily | France | 1 |
| ManEd | France | 33 |
| Manesse | Allemagne | 1 |
