| Name | Type | Country | Number |
|---|---|---|---|
| Takarajimasha宝島社 | Editor | Japan | 2 |
| Takarajimasha Bunko宝島社文庫 | Imprint | Japan | 1 |
| Takeshobo竹書房 | Editor | Japan | 9 |
| TezuComiテヅコミ | Magazine | Japan | 1 |
| The Hana to Yumeザ花とゆめ | Magazine | Japan | 1 |
| The Ruby | Magazine | Japan | 0 |
| The Sneakerザ・スニーカー | Magazine | Japan | 3 |
| ti.netティーアイネット | Editor | Japan | 2 |
| TO BooksTOブックス | Editor | Japan | 4 |
| Tokuma Novels Edgeトクマ・ノベルズEdge | Imprint | Japan | 1 |
| Tokuma Shoten徳間書店 | Editor | Japan | 14 |
| Tonari no Young Jumpとなりのヤングジャンプ | Magazine | Japan | 4 |
| torch comics | Imprint | Japan | 1 |
| Tōsuisha冬水社 | Editor | Japan | 0 |
| Tsubomiつぼみ | Magazine | Japan | 3 |
| Tugikuru Bookツギクルブックス | Website publishing | Japan | 0 |