| Societat ‘Foment de les Arts Catalanes’ | Societat 'Foment de les Arts Catalanes’ | 1908 | 1 | |
| Sam Wanamaker Playhouse | Sam Wanamaker Playhouse | 2023 – 2024 | 1 | |
| Společnost Jana Pištěka | Společnost Jana Pištěka | 1895 | 1 | |
| Stadttheater Bern | Stadttheater Bern | 1941 – 2016 | 5 | |
| Sveriges Radio | Sveriges Radio | 1958 | 5 | |
| Shanghai Symphony Orchestra | Shanghai Symphony Orchestra | 2007 | 1 | |
| South Asia Theatre Festival | South Asia Theatre Festival | 2006 | 2 | |
| Seattle Repertory Theatre | Seattle Repertory Theatre | 2018 | 1 | |
| Seattle Repertory Playhouse | Seattle Repertory Playhouse | 1931 – 2022 | 6 | |
| Svenska Riksteatern - Orebroensemblen | Svenska Riksteatern - Orebroensemblen | 1969 | 2 | |
| Sue Lefton Productions | Sue Lefton Productions | 1994 | 1 | |
| Studentteateret Immaturus | Studentteateret Immaturus | 2006 | 1 | |
| Sixth Annual Play Festival | Sixth Annual Play Festival | 1937 | 1 | |
| Saiko Geijutsuza | Saiko Geijutsuza | 1924 | 1 | |
| Soffia Guðlaugsdóttir | Soffia Guðlaugsdóttir | 1932 | 1 | |
| Skandinaviska Gästspelsturneen, Den | Den Skandinaviska Gästspelsturneen | 1890 | 2 | |
| Sächsische Staatstheater Dresden | Sächsische Staatstheater Dresden | 1920 – 1921 | 4 | |
| SMU-Meadows School of the Arts. Division of Theatre | SMU-Meadows School of the Arts. Division of Theatre | 2003 – 2005 | 2 | |
| 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 | |
| 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 | |
| SlowMachine | SlowMachine | 2024 | 1 | |
| Samina Peerzadas Ensemble | Samina Peerzadas Ensemble | 1992 – 1994 | 2 | |
| Städtische Schauspiele Baden-Baden | Städtische Schauspiele Baden-Baden | 1919 | 13 | |
| Sundrive Players, The | The Sundrive Players | 1965 | 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 | |
| Seoul Metropolitan Theater | The Seoul Metropolitan Theater | 2024 | 1 | |
| Svenska Inhemska Teatern | Svenska Inhemska Teatern | 1897 | 5 | |
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