| HLab | France | 143 |
| HMH | | 45 |
| HNP | | 1 |
| Hoaki | Espagne | 2 |
| Hobble Creek | | 1 |
| Hodder | Angleterre | 397 |
| Hodder & Stoughton | Angleterre | 691 |
| Hodderscape | Angleterre | 87 |
| Hoëbeke | France | 151 |
| Hofenberg | Allemagne | 1 |
| Hoffmann und Campe | Allemagne | 2 |
| Hogarth Press | Angleterre | 22 |
| Hoi | Suède | 1 |
| Holiday House | | 19 |
| Holmes & Meier | Etats-Unis | 1 |
| Holt Children's / Macmillan | Etats-Unis | 5 |
| Holt, Rinehart and Winston | Etats-Unis | 2 |
| Holy Ghost Writer | | 1 |
| Homard | France | 3 |
| Homnisphères | | 2 |
| Homoromance | | 296 |
| Honford Star | | 5 |
| Hongfei culture | France | 108 |
| Honno | France | 2 |
| Honoré Champion | France | 124 |
| Honorine | France | 2 |
| Hoover Ink | Etats-Unis | 7 |
| Hopewell Media | Etats-Unis | 1 |
| Hörbuch-Hamburg (HHV) | Allemagne | 6 |
| Horizon illimité | France | 2 |
| Horizons de France | France | 2 |
| Hörkultur | | 1 |
| Hors collection | France | 242 |
| Hors commerce | France | 17 |
| Hors d'atteinte | France | 44 |
| Hors limite | France | 2 |
| Horvath | France | 6 |
| Hot Corner Press | | 6 |
| Hot Key Books | Angleterre | 165 |
| Hot Pants Press | | 1 |
| Hot Tree Editing | | 5 |
| Houbunsha | Japon | 15 |
| Houghton Mifflin Harcourt | Etats-Unis | 209 |
| Hourra | France | 3 |
| House Made Of Dawn | France | 61 |
| House of Anansi | Angleterre | 11 |
| House of Nehesi | Etats-Unis | 1 |
| Houtekiet | Pays-Bas | 1 |
| Howard Books | France | 12 |
| Hoxton Mini Press | | 2 |
| Hozhoni | | 19 |
| HPF | | 10 |
| HRW | France | 7 |
| Huber | | 12 |
| Hughes de Chivré | France | 1 |
| Huginn & Muninn | France | 289 |
| Hugo & Cie | France | 2918 |
| Hugo Stern | France | 7 |
| Hugues de Queyssac | | 4 |
| Hugues Facorat | France | 11 |
| Huit | | 1 |
| Humanis | | 11 |
| Humanitas fiction | | 2 |
| Humanoids | | 6 |
| Humbird & Curlew | France | 17 |
| humenSciences | | 124 |
| Humerus Intentions Publishing LLC | | 1 |
| Humoir | France | 1 |
| Hurlantes éditrices | Canada | 1 |
| Hurlevent | France | 19 |
| Hurst | | 7 |
| Hurtubise | Canada | 581 |
| Husum | Allemagne | 1 |
| Hutchinson | France | 33 |
| Hy-Breizhil | | 3 |
| Hybris | | 1 |
| Hydolia | | 4 |
| Hydralune | France | 27 |
| Hydromel | France | 2 |
| Hyena | France | 7 |
| Hygée | | 5 |
| Hyoronsha | Japon | 10 |
| Hyperion Avenue | | 7 |
| Hyperion Books | Etats-Unis | 132 |
| Hypernova Publishing | | 3 |
| Hyphen SA | France | 2 |
| Hystérie | | 2 |
| Hystériques & Associées | France | 12 |
| HZ | France | 5 |
| I.B.Tauris | Angleterre | 8 |
| I.D. | France | 17 |
| IBC Publishing | Japon | 1 |
| Ibex Books | | 1 |
| Ibis Press | France | 1 |
| Ibis Rouge | France | 9 |
| Ibolya Virág | | 2 |
| iBookthèque | | 5 |
| Ichijinsha | Japon | 52 |
| Ici Bas | | 5 |
| ICI Interface | France | 1 |
