| Soffia Guðlaugsdóttir | Soffia Guðlaugsdóttir | 1932 | 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 | |
| Small World Big Sky Productions | Small World Big Sky Productions | 2005 | 1 | |
| Siegener Biennale | Siegener Biennale | 2012 | 1 | |
| Siena College | Siena College | | 1 | |
| 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 | |
| Station Noord | Station Noord | 2022 | 1 | |
| Sundrive Players, The | The Sundrive Players | 1965 | 1 | |
| 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 | |
| Sam Wanamaker Playhouse | Sam Wanamaker Playhouse | 2023 – 2024 | 1 | |
| Städtische Bühnen Düsseldorf | Städtische Bühnen Düsseldorf | 1946 | 1 | |
| Singapore Arts Festival | Singapore Arts Festival | 2007 | 1 | |
| Sommerteateret | Sommerteateret | 2006 | 1 | |
| Shanghai International Studies University | Shanghai International Studies University | 2010 | 1 | |
| Stone & Wings | Stone & Wings | 2006 | 1 | |
| Shunjuza | Shunjuza | 1922 | 1 | |
| Speilbilder Teater | Speilbilder Teater | 2011 | 1 | |
| Storsjöyran-festivalen | Storsjöyran-festivalen | 2000 | 1 | |
| Shingekisha | Shingekisha | 1914 | 1 | |
| Scriblers Dramatic Society, The | The Scriblers Dramatic Society | 1885 | 1 | |
| Stavanger Teaters Orkester | Stavanger Teaters Orkester | 1946 | 1 | |
| SWAN - South West Actors Network | SWAN - South West Actors Network | 2007 | 1 | |
| Spolek divadelních ochotníků Tyl | Spolek divadelních ochotníků Tyl | 1911 | 1 | |
| Scarlet Cup | Scarlet Cup Theatre | 2023 | 1 | |
| SlowMachine | SlowMachine | 2024 | 1 | |
| Shakespeare’s Globe | Shakespeare’s Globe | | | |
| Staatsschauspiel (Ballhof) | Staatsschauspiel (Ballhof) | | | |
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