| Theater der Modernen | Theater der Modernen | 1894 – 1895 | 11 | |
| Theater der Litterarischen Gesellschaft in Leipzig | Theater der Litterarischen Gesellschaft in Leipzig | 1896 – 1897 | 3 | |
| Theater Department of Sangmyung University's College of Arts | Theater Department of Sangmyung University's College of Arts | 2023 | 1 | |
| Theater CNU | Theater CNU | 2021 | 1 | |
| Theater CIRCA | Theater CIRCA | 2024 | 2 | |
| Theater Bielefeld | Theater Bielefeld | 2004 – 2016 | 4 | |
| Theater Biel Solothurn | Theater Biel Solothurn | 2003 – 2019 | 25 | |
| Theater am Schiffbauerdamm | Theater am Schiffbauerdamm | 1950 | 1 | |
| Theater am Horst-Wessel-Platz | Theater am Horst-Wessel-Platz | 1933 | 4 | |
| Theater am Bülowplatz | Theater am Bülowplatz | 1918 | 5 | |
| Theater am Brunnenhof | Theater am Brunnenhof | 1949 – 1950 | 3 | |
| The Utopian Theatre Asylum (TUTA) | The Utopian Theatre Asylum (TUTA) | 2020 | 1 | |
| The Inspired Acting Company | The Inspired Acting Company | 2025 | 1 | |
| The Ilya Bobkov Workshop Theater | The Ilya Bobkov Workshop Theater | 2025 | 1 | |
| The Embassy of the Republic of Bulgaria in the Republic of Slovenia | The Embassy of the Republic of Bulgaria in the Republic of Slovenia | 2024 | 1 | |
| Thanhouser Company | Thanhouser Film Corporation (Thanhouser Company) | 1909 | 4 | |
| Thalia Theater | Thalia Theater | 1975 – 2022 | 21 | |
| Test Pilot Productions | Test Pilot Productions | 2006 | 2 | |
| Territorio Violeta | Territorio Violeta | 2023 | 1 | |
| Tequatre | Tequatre | 2024 | 18 | |
| Tennent Productions Ltd. | Tennent Productions Ltd. | 1953 | 14 | |
| TemprArt Teatro Arte Tempra | TemprArt Teatro Arte Tempra | 2019 | 1 | 1 |
| Temporada Alta | Temporada Alta | 2006 | 1 | |
| Telefilm Saar | Telefilm Saar | 1974 | 2 | |
| Tel Aviv-Yafo First International Theatre Festival | Tel Aviv-Yafo First International Theatre Festival | 2009 | 1 | |
| Tehrik-e-Niswan | Tehrik-e-Niswan | 2006 – 2024 | 5 | |
| Teatrul Nottara | Teatrul Nottara | 2022 | 1 | |
| Teatrón | Teatrón | 1989 | 1 | |
| Teatro Studio Jankowski | Teatro Studio Jankowski | 2013 | 1 | |
| Teatro Stabile di Napoli | Teatro Stabile di Napoli | 2012 – 2018 | 18 | 3 |
| Teatro Stabile di Genova | Teatro Stabile di Genova | 1960 – 2018 | 12 | |
| Teatro Stabile di Catania | Teatro Stabile di Catania | 2024 | 2 | 1 |
| Teatro Stabile della Sardegna | Teatro Stabile della Sardegna | 2013 | 2 | 2 |
| Teatro Stabile dell'Umbria | Teatro Stabile dell'Umbria | 2019 – 2020 | 32 | |
| Teatro Stabile del Veneto | Teatro Stabile del Veneto | 2025 | 1 | |
| Teatro Stabile del Friuli Venezia Giulia | Teatro Stabile del Friuli Venezia Giulia | 1968 – 2014 | 31 | |
| Teatro Spazio Libero | Teatro Spazio Libero | 2013 | 2 | 2 |
| Teatro San Martín | Teatro San Martín | 2001 | 6 | 6 |
| Teatro RossoSimona | Teatro RossoSimona | 2019 | 2 | 2 |
| Teatro Rodante Dominicano | Teatro Rodante Dominicano | 2025 | 1 | |
| Teatro Randagio | Teatro Randagio | 2024 | 1 | 1 |
| Teatro Popolare Italiano | Teatro Popolare Italiano | 2013 | 2 | |
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