| Inébranlable | France | 1 |
| INECAT | France | 1 |
| Ineja Press | | 2 |
| Infimes | France | 6 |
| Infini Challenges | France | 1 |
| Infinite Acacia | France | 2 |
| Infinity | France | 1235 |
| Influence et média | | 1 |
| Influx Press | Angleterre | 2 |
| Infoa | France | 2 |
| Infodium | France | 1 |
| Infolio | Suisse | 47 |
| Ink Book | France | 22 |
| Ink Monster | | 9 |
| Inklore | | 7 |
| Inkshares | Etats-Unis | 5 |
| Inkspell | Angleterre | 2 |
| Inkyard Press | Etats-Unis | 60 |
| InLibroVeritas | France | 1 |
| INPES | France | 5 |
| INRA | France | 4 |
| Insel | Allemagne | 24 |
| Insight (US) | Etats-Unis | 25 |
| Insight (UK) | Angleterre | 11 |
| InsomNic | | 2 |
| Inspirantia | | 4 |
| Institut du Monde Arabe | France | 1 |
| Institut Français de Mode / Regard | France | 2 |
| Institut Mémoires de l'édition contemporaine (IMEC) | France | 3 |
| Institut national d’histoire de l’art (INHA) | France | 1 |
| Institut Suédois | France | 1 |
| Instituto Cubano del Libro | Cuba | 1 |
| Insula | | 4 |
| Insulae | | 1 |
| Inter | France | 9 |
| Inter-Livres | France | 4 |
| InterEditions | | 59 |
| Interférences | France | 28 |
| Interkeltia | France | 4 |
| Interlinea | Italie | 1 |
| Interlink | Angleterre | 2 |
| Interlude Press | | 20 |
| Intermix | Etats-Unis | 12 |
| International Manga Association | France | 1 |
| Intersentia | | 3 |
| Intersistem | | 2 |
| Intervalles | France | 111 |
| Intervista | France | 50 |
| Intrepid Reads | | 2 |
| Inukshuk | | 7 |
| inusitées | Canada | 1 |
| Invenit | France | 25 |
| Inventaire/Invention | | 1 |
| Invertido Ediciones | Chili | 1 |
| Investig’Action | Belgique | 5 |
| Inzemoon | | 2 |
| IP | | 1 |
| Ipagine | France | 3 |
| Ipanema | | 16 |
| Ipomée | France | 5 |
| Irène Pauletich | France | 5 |
| Irfan | France | 2 |
| IRH Press | | 1 |
| Irodori Comics | | 1 |
| Iron Circus Comics | Etats-Unis | 1 |
| IRTS Languedoc-Roussillon | France | 1 |
| Irysnoir | | 1 |
| IS | France | 62 |
| IS | France | 2 |
| Isabelle Sauvage | France | 4 |
| Isan Manga | | 26 |
| Ishi press | | 4 |
| Isis | Canada | 27 |
| Island Press | | 3 |
| Island Tales Press | | 9 |
| Isoète | France | 4 |
| ISS UNIL | Suisse | 2 |
| Issekinicho | | 21 |
| Istros Books | | 1 |
| Istya & Cie | France | 10 |
| It Books | Etats-Unis | 17 |
| Itak | | 2 |
| Italiques | France | 2 |
| Itero | France | 3 |
| Itinéraires | | 2 |
| Itka | France | 3 |
| iUniverse | Etats-Unis | 7 |
| IV Horsemen | | 3 |
| Ivalentiah | France | 1 |
| Ivan Davy | | 1 |
| Ivréa | France | 16 |
| Ivres de Livres | France | 4 |
| Ivy Books | France | 5 |
| Iwa | | 10 |
| Iwari | | 1 |
| iXe | | 37 |
| Ixelles | France | 44 |
| J | France | 30 |
| J'ai Lu | France | 14499 |
| J'ai Lu / Fluide glacial | | 6 |
