| Skien International Ibsen Conference 2009 | Skien International Ibsen Conference 2009 | 2009 | 1 | |
| Skien International Ibsen Conference 2010 | Skien International Ibsen Conference 2010 | 2010 | 2 | |
| Skuespillerlinjen | Skuespillerlinjen | 1992 | 1 | |
| Skuespillerutdanninga ved Høgskolen i Nord-Trøndelag (HINT) | Skuespillerutdanninga ved Høgskolen i Nord-Trøndelag (HINT) | 2010 – 2011 | 2 | |
| Skådebanans ambulerande teatersällskap | Skådebanans ambulerande teatersällskap | 1911 | 13 | |
| Sladký časy | Sladký časy (Sweet times) | 2023 | 1 | |
| Slovene National Theatre Nova Gorica | Slovene National Theatre Nova Gorica | 2024 | 1 | |
| SlowMachine | SlowMachine | 2024 | 1 | |
| SM Arte e Cultura | SM Arte e Cultura | 2024 | 1 | |
| Small World Big Sky Productions | Small World Big Sky Productions | 2005 | 1 | |
| SMU-Meadows School of the Arts. Division of Theatre | SMU-Meadows School of the Arts. Division of Theatre | 2003 – 2005 | 2 | |
| Sociedad Constructura de Pianos | Sociedad Constructura de Pianos | 1907 | 1 | |
| Societa per Attori e Parol&Musica, La | La Societa per Attori e Parol&Musica | 2002 – 2005 | 16 | |
| Societat ‘Foment de les Arts Catalanes’ | Societat 'Foment de les Arts Catalanes’ | 1908 | 1 | |
| Soffia Guðlaugsdóttir | Soffia Guðlaugsdóttir | 1932 | 1 | |
| Sommerteateret | Sommerteateret | 2006 | 1 | |
| Sound & Light Egypt | Sound & Light Egypt | 2006 | 1 | |
| South Asia Theatre Festival | South Asia Theatre Festival | 2006 | 2 | |
| South High School | South High School | 1923 | 1 | |
| Southern Tier Actors Read | Southern Tier Actors Read | 2024 | 1 | |
| Space Productions | Space Productions | 2010 – 2011 | 2 | |
| Speilbilder Teater | Speilbilder Teater | 2011 | 1 | |
| Společnost Jana Pištěka | Společnost Jana Pištěka | 1895 | 1 | |
| Spolek divadelních ochotníků Tyl | Spolek divadelních ochotníků Tyl | 1911 | 1 | |
| Spoleto Festival | Spoleto Festival | 2005 | 1 | |
| Spring Willow Society | Spring Willow Society | 1914 | 1 | |
| St. Olaf College Speech and Drama Department | St. Olaf College Speech and Drama Department | 1951 | 1 | |
| Stabile Mobile | Stabile Mobile | 2014 | 2 | 2 |
| Stadttheater Basel | Stadttheater Basel | 1928 – 1930 | 2 | |
| Stadttheater Bern | Stadttheater Bern | 1941 – 2016 | 5 | |
| Stadttheater Landsberg (Warthe) | Stadttheater Landsberg (Warthe) | 1928 | 1 | |
| Stadttheater Salzburg | Stadttheater Salzburg | 1911 | 3 | |
| Stage Society | Stage Society | 1900 – 1903 | 5 | |
| Stage West Theatre Company | Stage West Theatre Company | 1996 | 1 | |
| Stagecraft Theatre | Stagecraft Theatre | 2011 | 1 | |
| Stamsund Internasjonale Teaterfestival | Stamsund Internasjonale Teaterfestival | 2012 | 1 | |
| Starlight Theatre Co-operative | Starlight Theatre Co-operative | 2008 | 1 | |
| State Opera of Tatarstan, The | The State Opera of Tatarstan (Musa Džalil Tatar theatre of opera and ballet) | 2003 – 2005 | 2 | |
| Statens teaterhøgskole | Statens teaterhøgskole | 1994 – 2003 | 9 | 3 |
| Station Noord | Station Noord | 2022 | 1 | |
| Stavanger Teaters Orkester | Stavanger Teaters Orkester | 1946 | 1 | |
| Stephens College | Stephens College | 1974 | 1 | |
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