| Tagle-Willingham, Ruby | Ruby Tagle-Willingham | Director | 2024 | 2 | |
| Toccafondi, Leo | Leo Toccafondi | Director | 1980 | 1 | |
| Thoma, Simone | Simone Thoma | Director | 2019 | 1 | |
| Torella, Sandro | Sandro Torella | Director | 2014 | 1 | |
| Taylor, Gill | Gill Taylor | Director | 2024 | 1 | |
| Tsutsui, Yuki | Yuki Tsutsui | Director | 2024 | 1 | |
| Thorson, Greg | Greg Thorson | Director | 2024 | 1 | |
| Tritek, Helena | Helena Tritek | Director | 2024 | 1 | |
| Turley, Leah | Leah Turley | Director | 2024 | 1 | |
| Thaharani, Rama | Rama Thaharani | Director | 2019 | 1 | |
| Tournier, Sophie | Sophie Tournier | Director | 2025 | 2 | |
| Tamura, Isao | Isao Tamura | Designer, Sound Designer | 1968 - 1990 | 7 | |
| Tasker, John | John Tasker | Designer, Producer | 1961 | 2 | |
| Tomtsini, Sokol | Sokol Tomtsini | Designer, Lighting Designer | 2001 - 2007 | 6 | |
| Thornton, Jonne | Jonne Thornton | Designer, Lighting Designer | 1970 | 2 | |
| Taylor, James | James Taylor | Designer, Lighting Designer | 1993 | 2 | |
| Tilton, James | James Tilton | Designer, Lighting Designer | 1965 - 1967 | 5 | |
| Thomas, Hugh | Hugh Thomas | Designer, Lighting Designer | 1963 | 2 | |
| Tomov, Rumen | Rumen Tomov | Designer, Director | 1983 - 1994 | 3 | |
| Truffer, Alex | Alex Truffer | Designer, Director | 2009 | 2 | |
| Troller, Urs | Urs Troller | Designer, Director | 2010 | 2 | |
| Tester, Ted | Ted Tester | Designer, Director | 1975 | 2 | |
| Taylor, David | David Taylor | Designer | 1999 | 1 | |
| Thelander, Lesley | Lesley Thelander | Designer | 1982 | 1 | |
| Thompson, Mark | Mark Thompson | Designer | 1991 | 1 | |
| Tietjens, Michael | Michael Tietjens | Designer | 1983 | 1 | |
| Tindberg, Snorre | Snorre Tindberg | Designer | 1968 - 1990 | 11 | |
| Tośta, Antoni | Antoni Tośta | Designer | 1965 | 1 | |
| Topolski, Zdzisław | Zdzisław Topolski | Designer | 1960 | 1 | |
| Treplin, Agnes | Agnes Treplin | Designer | 2002 | 1 | |
| Tvardovskaja, O. | O. Tvardovskaja | Designer | 1999 - 2000 | 2 | |
| Treutler, Malgorzata | Malgorzata Treutler | Designer | 1973 - 1989 | 2 | |
| Trad, L. | L. Trad | Designer | 1946 | 1 | |
| Tarasova, E. | E. Tarasova | Designer | 1964 | 1 | |
| Tröster, F. | F. Tröster | Designer | 1943 - 1944 | 2 | |
| Tripp, Tony | Tony Tripp | Designer | 1982 - 2002 | 3 | 1 |
| Traversa, Andrea | Andrea Traversa | Designer | 2011 | 1 | |
| Turrell, Leanne | Leanne Turrell | Designer | 2011 | 1 | |
| Thatcher, Emma | Emma Thatcher | Designer | 2010 - 2011 | 2 | |
| Täuber, Harry | Harry Täuber | Designer | 1925 | 1 | |
| Tetmajer, Włodzimierz | Włodzimierz Tetmajer | Designer | 1907 | 1 | |
| Thorstensen, Lise | Lise Thorstensen | Designer | 2007 | 1 | |
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