| T., Tay | 5 Books | 2 Series |
| Tachna, Ariel | 53 Books | 3 Series |
| Taffel, Lily | 33 Books | 8 Series |
| Tagliaferro, John; Tagliaferro, Suki | 6 Books | 1 Series |
| Talon P.S. | 10 Books | 2 Series |
| Tan, Claudia | 6 Books | 1 Series |
| Tate, Keely | 26 Books | 3 Series |
| Tate, Pearl | 27 Books | 3 Series |
| Taylor, Lola | 17 Books | 4 Series |
| Taylor, Regan | 24 Books | 1 Series |
| Taylor, Taryn Leigh | 9 Books | 1 Series |
| Tellier, Cecile | 17 Books | 1 Series |
| Tenorio, Dee | 27 Books | 3 Series |
| Teshco, Mel | 85 Books | 13 Series |
| Thatcher, Ari | 40 Books | 2 Series |
| Thomas, Kitty | 39 Books | 2 Series |
| Thomas, M.A. | 11 Books | 2 Series |
| Thompson, Melanie | 20 Books | 1 Series |
| Thompson, V. Lynn | 3 Books | 1 Series |
| Thomson, McKinlay | 19 Books | 4 Series |
| Thorne, Diane | 20 Books | 2 Series |
| Thorne, Vanessa | 7 Books | 2 Series |
| Throne, Tatum | 49 Books | 6 Series |
| Tibbitts, C.A. | 14 Books | 2 Series |
| Tipton, A.J. | 56 Books | 8 Series |
| Titheniel, Sophia | 12 Books | 3 Series |
| Tompkins, Denise | 7 Books | 1 Series |
| Topol, Carolyn Levine | 11 Books | 1 Series |
| Toppen, Melissa | 57 Books | 5 Series |
| Torquay, Lisa | 26 Books | 6 Series |
| Tortuga, B.A. | 242 Books | 3 Series |
| Tower, Veronica | 44 Books | 3 Series |
| Towers, Terry | 54 Books | 2 Series |
| Townsend, Larry | 19 Books | 1 Series |
| Trace, Dakota | 57 Books | 8 Series |
| Treanor, Marie | 55 Books | 9 Series |
| Tremaine, Tessa | 5 Books | 1 Series |
| Trent, H.E. | 7 Books | 1 Series |
| Trent, Louisa | 49 Books | 2 Series |
| Tuhart, Marie | 49 Books | 1 Series |
| Tulane, Mimi | 4 Books | 1 Series |
| Tunstall, Kit | 58 Books | 7 Series |
| Turner, Skye | 81 Books | 11 Series |
| Turner, Twyla | 18 Books | 3 Series |
| Twining, Kristine | 3 Books | 1 Series |
| Tyler, Lynn | 27 Books | 9 Series |
| Tyne, Bryl R. | 21 Books | 2 Series |