| Studentteatret | Studentteatret | 2000 | 1 | |
| Studio of Theatre Arts, The | The Studio of Theatre Arts | 1935 | 1 | |
| Siegener Biennale | Siegener Biennale | 2012 | 1 | |
| Saint Sebastian Players | Saint Sebastian Players | 2024 | 1 | |
| Secret House | Secret House | 2024 | 1 | |
| Small World Big Sky Productions | Small World Big Sky Productions | 2005 | 1 | |
| Skuespillerlinjen | Skuespillerlinjen | 1992 | 1 | |
| Societat ‘Foment de les Arts Catalanes’ | Societat 'Foment de les Arts Catalanes’ | 1908 | 1 | |
| SM Arte e Cultura | SM Arte e Cultura | 2024 | 1 | |
| Sundrive Players, The | The Sundrive Players | 1965 | 1 | |
| Snow College Performing Arts | Snow College Performing Arts | 2025 | 1 | |
| Shakespeare Playhouse of New York, The | The Shakespeare Playhouse of New York | 1921 | 1 | |
| Stamsund Internasjonale Teaterfestival | Stamsund Internasjonale Teaterfestival | 2012 | 1 | |
| Sydney Opera House Trust | Sydney Opera House Trust | 1976 | 1 | |
| Seattle Repertory Theatre | Seattle Repertory Theatre | 2018 | 1 | |
| Scotland's National Young People's Theatre Festival | Scotland's National Young People's Theatre Festival | 2010 | 1 | |
| Sixth Festival | The Sixth Festival | 2024 | 1 | |
| Städtische Bühnen Düsseldorf | Städtische Bühnen Düsseldorf | 1946 | 1 | |
| Skien International Ibsen Conference 2009 | Skien International Ibsen Conference 2009 | 2009 | 1 | |
| Shanghai International Studies University | Shanghai International Studies University | 2010 | 1 | |
| Slovene National Theatre Nova Gorica | Slovene National Theatre Nova Gorica | 2024 | 1 | |
| Solarium Asbl | Solarium Asbl | 2022 | 1 | |
| Singapore Arts Festival | Singapore Arts Festival | 2007 | 1 | |
| Sommerteateret | Sommerteateret | 2006 | 1 | |
| Shunjuza | Shunjuza | 1922 | 1 | |
| Speilbilder Teater | Speilbilder Teater | 2011 | 1 | |
| Scribblers Hongkong | Scribblers Hongkong | 2006 | 1 | |
| Stone & Wings | Stone & Wings | 2006 | 1 | |
| Scriblers Dramatic Society, The | The Scriblers Dramatic Society | 1885 | 1 | |
| Siena College | Siena College | 2023 | 1 | |
| Sound & Light Egypt | Sound & Light Egypt | 2006 | 1 | |
| Singapore Repertory Theatre | Singapore Repertory Theatre | 2025 | 1 | |
| Storsjöyran-festivalen | Storsjöyran-festivalen | 2000 | 1 | |
| Shingekisha | Shingekisha | 1914 | 1 | |
| Sladký časy | Sladký časy (Sweet times) | 2023 | 1 | |
| Southern Tier Actors Read | Southern Tier Actors Read | 2024 | 1 | |
| Stavanger Teaters Orkester | Stavanger Teaters Orkester | 1946 | 1 | |
| Sumikko Ningyō Gekidan Nitchi | Sumikko Ningyō Gekidan Nitchi (Nitch Puppet Theatre Company) | 2025 | 1 | |
| SWAN - South West Actors Network | SWAN - South West Actors Network | 2007 | 1 | |
| Spolek divadelních ochotníků Tyl | Spolek divadelních ochotníků Tyl | 1911 | 1 | |
| São João National Theater | São João National Theater | 2021 | 1 | |
| Städtische Bühnen Hannover | Städtische Bühnen Hannover | 1949 | 1 | |
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