| Tilley, Martin | Martin Tilley | Costume Designer | 1981 | 1 | |
| Türkoğlu, Nalan | Nalan Türkoğlu (Nalan Turkoglu) | Costume Designer | 1987 | 1 | |
| Tait, Nikki | Nikki Tait | Costume Designer | 1984 | 1 | |
| Turcanu, A. | A. Turcanu | Costume Designer | 1964 | 2 | |
| Tosa, Yoshi | Yoshi Tosa | Costume Designer | 1976 | 1 | |
| Tasdighi, Manijeh | Manijeh Tasdighi | Costume Designer | 2018 | 1 | |
| Taran, Sabine | Sabine Taran | Costume Designer | 2018 - 2019 | 8 | |
| Téroitin, Patrick | Patrick Téroitin | Costume Designer | 1994 | 4 | |
| Trikerioti, Mayou | Mayou Trikerioti | Costume Designer | 2022 | 4 | |
| Toobe, Federico | Federico Toobe | Costume Designer | 2023 | 1 | |
| Tihanyi, Ildikó | Ildikó Tihanyi | Costume Designer | 2022 | 1 | |
| Taddei, Andrea | Andrea Taddei | Costume Designer, Designer | 2000 - 2006 | 20 | |
| Titze, Sebastian | Sebastian Titze | Costume Designer, Designer | 1975 - 1995 | 4 | |
| Tolo, Kathrine | Kathrine Tolo | Costume Designer, Designer | 1998 - 2010 | 27 | |
| Trienekens, Elvira | Elvira Trienekens | Costume Designer, Designer | 1997 | 2 | |
| Tautz, Franz | Franz Tautz | Costume Designer, Designer | 1961 | 2 | |
| Träbig, Ilse | Ilse Träbig | Costume Designer, Designer | 1975 | 2 | |
| Tsao, Calvin | Calvin Tsao | Costume Designer, Designer | 1973 | 2 | |
| Thormann, Hans-Ulrich | Hans-Ulrich Thormann | Costume Designer, Designer | 1979 | 2 | |
| Ter-Arutunian, Rouben | Rouben Ter-Arutunian | Costume Designer, Designer | 1976 | 2 | |
| Thomasberger, Erika | Erika Thomasberger | Costume Designer, Designer | 1953 - 1962 | 5 | |
| Tschunko, Maxi | Maxi Tschunko | Costume Designer, Designer | 1959 - 1967 | 6 | |
| Thaler, Susanne | Susanne Thaler | Costume Designer, Designer | 1984 - 2011 | 13 | |
| Thorbjørnsen, Bård, Lie | Bård Lie Thorbjørnsen | Costume Designer, Designer | 2010 - 2017 | 100 | |
| Taravella, Luisa | Luisa Taravella | Costume Designer, Designer | 1988 - 1989 | 18 | |
| Tienhooven, Theo | Theo Tienhooven | Costume Designer, Designer | 1991 - 2009 | 90 | |
| Torp, Kristin | Kristin Torp | Costume Designer, Designer | 1988 - 2013 | 5 | |
| Trembleau, Muriel | Muriel Trembleau | Costume Designer, Designer | 1994 | 2 | |
| Toffolutti, Ezio | Ezio Toffolutti | Costume Designer, Designer | 1996 - 1998 | 4 | |
| Taylor, Leslie | Leslie Taylor | Costume Designer, Designer | 1998 - 1999 | 4 | |
| Talacko, Patricia | Patricia Talacko | Costume Designer, Designer | 2005 - 2011 | 8 | |
| Todorova, Elka | Elka Todorova | Costume Designer, Designer | 2001 | 2 | |
| Taillefert, Jean-Luc | Jean-Luc Taillefert | Costume Designer, Designer | 2007 - 2008 | 8 | |
| Trikerioti, Magiou | Magiou Trikerioti | Costume Designer, Designer | 2008 | 2 | |
| Toledo, Navalú | Navalú Toledo | Costume Designer, Designer | 2010 | 2 | |
| Tarragüel Rubio, Alex | Alex Tarragüel Rubio | Costume Designer, Designer | 2011 | 2 | |
| Tewes, Joki | Joki Tewes | Costume Designer, Designer | 2015 - 2017 | 2 | |
| Tsarouchis, Giannis | Giannis Tsarouchis | Costume Designer, Designer | 1943 - 1964 | 4 | |
| Tsekoura, Errieti | Errieti Tsekoura | Costume Designer, Designer | 2012 | 2 | |
| Tofan, Mihai | Mihai Tofan | Costume Designer, Designer | 1966 - 1975 | 4 | |
| Triana, Rafael | Rafael Triana | Costume Designer, Designer | 2013 | 2 | |
| Thomsen, Olivia | Olivia Thomsen | Costume Designer, Designer | 2017 | 2 | |
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