| Transboréal | France | 143 |
| Transcontinental | France | 14 |
| Transignum | France | 1 |
| Transimaginaires | | 4 |
| Transit | France | 14 |
| Transworld | Irlande | 4 |
| Transworld digital | France | 54 |
| Trapeze | | 32 |
| Trash | | 17 |
| Traugott Bautz | Allemagne | 1 |
| Travelin' Hoosier Books | Inde | 2 |
| Traverse | | 6 |
| Tre Lune | Italie | 1 |
| TRE60 | Italie | 1 |
| Trécarré | France | 52 |
| Tredition | | 8 |
| Treffendel | | 1 |
| Trèfle à quatre feuilles | Canada | 2 |
| Treize étrange | France | 53 |
| Treizième Lune | France | 2 |
| Trepidatio | Etats-Unis | 4 |
| Treville | France | 2 |
| Triad | Etats-Unis | 2 |
| Triades | | 1 |
| Triangle postals | | 2 |
| Triarchy Press | Angleterre | 1 |
| Triartis | France | 13 |
| TRIAS | Allemagne | 4 |
| Tribew | | 1 |
| Tribord | France | 3 |
| Trilogie Éditions | France | 10 |
| Trinity University Press | Etats-Unis | 3 |
| Trinôme | France | 5 |
| Trinquette Publishing | Etats-Unis | 6 |
| Triptyque | France | 52 |
| Triskel | France | 7 |
| Triskele Books | Angleterre | 3 |
| Tristram | France | 82 |
| Triumph | Etats-Unis | 1 |
| Trois | France | 4 |
| Trois Petits Points (Huleux) | | 12 |
| Trois.L. | | 3 |
| Trompe-l'oeil | France | 1 |
| Trop Mad | France | 1 |
| Tropen | Allemagne | 2 |
| Tropismes | France | 9 |
| Troubador Publishing | | 8 |
| Trouble | France | 4 |
| True Myths Press | | 1 |
| TSR | France | 11 |
| Tsuru | | 1 |
| Tubonia | France | 3 |
| Tuk-tuk | | 1 |
| Tule Publishing | Etats-Unis | 5 |
| Tundra Books | France | 34 |
| Tunué | Italie | 2 |
| Tupperware | France | 4 |
| Turner Publishing | Etats-Unis | 4 |
| Turquoise | | 8 |
| Turtleback Books | Etats-Unis | 10 |
| Tusitala | | 17 |
| Tusquets | France | 33 |
| Tutti Frutti | France | 7 |
| Tutti Quanti | | 4 |
| TuttiStori | | 11 |
| Tuttle | France | 25 |
| Twayne Publishers | Etats-Unis | 1 |
| Twelfth Planet Press | Australie | 1 |
| Twelve | France | 12 |
| Twenty7 | | 5 |
| Twinkle | France | 22 |
| Twisted E-Publishing | | 35 |
| Two Books | | 1 |
| Two Dollar Radio | Etats-Unis | 6 |
| Two Lines Press | | 4 |
| Two Roads | Angleterre | 26 |
| Two Waves Books | Etats-Unis | 1 |
| Twopenny Books | Angleterre | 1 |
| Txalaparta | France | 2 |
| TXT | France | 1 |
| Tyndale House | | 15 |
| Typewriter Pub | Etats-Unis | 2 |
| Typo | France | 28 |
| U.S. Naval Institute Press | Etats-Unis | 1 |
| Ubik-Art | France | 2 |
| Udir | France | 1 |
| Udon entertainment | | 20 |
| Uei shiang | Chine | 2 |
| UGA | France | 4 |
| UGE | France | 4 |
| Ugly Duckling Press | Etats-Unis | 0 |
| Ugo Guanda | Italie | 5 |
| Ugo mursia editore | Italie | 2 |
| Uitgeverij Q | Pays-Bas | 6 |
| Ulisse | France | 8 |
| Ulisseia | Portugal | 1 |
| Ullmann | | 8 |
| Ullstein | France | 48 |
| Ulmann | France | 3 |
| Ulmer | France | 136 |
