| S. Marc Testa | Ph.D. | Yes | | 18+ | | |
| Nicholas Thaler | Ph.D. | Yes | | children, adolescents, adults | | |
| Frederick W. Theye | Ph.D. | No | | | | |
| Armin Paul Thies | Ph.D. | No | | | | |
| Armin P. Thies | Ph.D. | No | | | | |
| Darryl Thomander | Ph.D. | No | | | | |
| Nina H. Thomas | Ph.D. | Yes | | Child, Adolescent, Young Adult | | |
| W. Brian Thomas | Psy.D. | Yes | | 16 - 90's | - Alabama
- Mississippi
- Tennessee
| |
| Jon C. Thompson | Psy.D. | Yes | | | | |
| Matthew D. Thompson | Psy.D. | Yes | | | | |
| Nora M. Thompson | Ph.D. | Yes | | | | |
| Janine A. Tiago | Ph.D. | Yes | | | | |
| Sarah Tlustos-Carter | Ph.D. | Yes | | Birth - 21 | | |
| Christopher C. Tolsdorf | Ph.D. | No | | | | |
| Robert J. Tomaszewski | Ph.D. | Yes | | | | |
| Karen Torres | Psy.D. | Yes | | Adults 18+ | | |
| Brenda D. Townes | Ph.D. | No | | | | |
| Stephanie Jane Towns | Psy.D. | Yes | | 18+ | | |
| Christine L. Trask | Ph.D. | Yes | | 3-35 | | |
| Jennifer Travis Seidl | Ph.D. | Yes | | 18+ | | |
| Alexander I. Troster | Ph.D. | Yes | | 18-90 | | |
| David Tsai | Ph.D. | No | | | | |
| John Tsanadis | Ph.D. | Yes | | 8+ | | |
| David M. Tucker | Ph.D. | Yes | | | | |
| David E. Tupper | Ph.D. | No | | | | |