| Statens teaterhøgskole | Statens teaterhøgskole | 1994 – 2003 | 9 | 3 |
| Scuola di Musica Il Flauto Magico | Scuola di Musica Il Flauto Magico | 2024 | 4 | 2 |
| Stabile Mobile | Stabile Mobile | 2014 | 2 | 2 |
| Studio Formula Nuovo Balletto | Studio Formula Nuovo Balletto | 1975 | 1 | 1 |
| Saarländischer Rundfunk | Saarländischer Rundfunk | 1974 | 2 | 1 |
| SMU-Meadows School of the Arts. Division of Theatre | SMU-Meadows School of the Arts. Division of Theatre | 2003 – 2005 | 2 | |
| SM Arte e Cultura | SM Arte e Cultura | 2024 | 1 | |
| Studentteatret | Studentteatret | 2000 | 1 | |
| Studio of Theatre Arts, The | The Studio of Theatre Arts | 1935 | 1 | |
| St. Olaf College Speech and Drama Department | St. Olaf College Speech and Drama Department | 1951 | 1 | |
| Stagecraft Theatre | Stagecraft Theatre | 2011 | 1 | |
| Students of Theater 259 Production Class | Students of Theater 259 Production Class | 2023 | 1 | |
| Spoleto Festival | Spoleto Festival | 2005 | 1 | |
| Stadttheater Landsberg (Warthe) | Stadttheater Landsberg (Warthe) | 1928 | 1 | |
| Sydney Theatre Company | Sydney Theatre Company | 1984 – 2006 | 6 | |
| Sixth Festival | The Sixth Festival | 2024 | 1 | |
| Small World Big Sky Productions | Small World Big Sky Productions | 2005 | 1 | |
| Stadttheater Salzburg | Stadttheater Salzburg | 1911 | 3 | |
| Siegener Biennale | Siegener Biennale | 2012 | 1 | |
| Siena College | Siena College | | 1 | |
| Samina Peerzadas Ensemble | Samina Peerzadas Ensemble | 1992 – 1994 | 2 | |
| Städtische Schauspiele Baden-Baden | Städtische Schauspiele Baden-Baden | 1919 | 13 | |
| Slovene National Theatre Nova Gorica | Slovene National Theatre Nova Gorica | 2024 | 1 | |
| Studentersamfundets Interne Teater | Studentersamfundets Interne Teater | 1994 – 2006 | 2 | |
| Shakespeare Playhouse of New York, The | The Shakespeare Playhouse of New York | 1921 | 1 | |
| Stamsund Internasjonale Teaterfestival | Stamsund Internasjonale Teaterfestival | 2012 | 1 | |
| Skuespillerlinjen | Skuespillerlinjen | 1992 | 1 | |
| Sladký časy | Sladký časy (Sweet times) | 2023 | 1 | |
| Svenska Inhemska Teatern | Svenska Inhemska Teatern | 1897 | 5 | |
| Sundrive Players, The | The Sundrive Players | 1965 | 1 | |
| Schauspiel Bonn | Schauspiel Bonn | 1987 – 2006 | 11 | |
| Skien International Ibsen Conference 2009 | Skien International Ibsen Conference 2009 | 2009 | 1 | |
| Sydney Opera House Trust | Sydney Opera House Trust | 1976 | 1 | |
| São João National Theater | São João National Theater | 2021 | 1 | |
| Scotland's National Young People's Theatre Festival | Scotland's National Young People's Theatre Festival | 2010 | 1 | |
| Societa per Attori e Parol&Musica, La | La Societa per Attori e Parol&Musica | 2002 – 2005 | 16 | |
| Scribblers Hongkong | Scribblers Hongkong | 2006 | 1 | |
| Städtische Bühnen Düsseldorf | Städtische Bühnen Düsseldorf | 1946 | 1 | |
| Singapore Arts Festival | Singapore Arts Festival | 2007 | 1 | |
| Sommerteateret | Sommerteateret | 2006 | 1 | |
| Städtische Theater Leipzig | Städtische Theater Leipzig | 1913 – 1928 | 40 | |
| State Opera of Tatarstan, The | The State Opera of Tatarstan (Musa Džalil Tatar theatre of opera and ballet) | 2003 – 2005 | 2 | |
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