| Societat ‘Foment de les Arts Catalanes’ | Societat 'Foment de les Arts Catalanes’ | 1908 | 1 | |
| Svenska Inhemska Teatern | Svenska Inhemska Teatern | 1897 | 5 | |
| Statens Kunstfond | Statens Kunstfond (Danish Arts Foundation) | 2024 | 2 | |
| Societa per Attori e Parol&Musica, La | La Societa per Attori e Parol&Musica | 2002 – 2005 | 16 | |
| Städtische Bühnen Düsseldorf | Städtische Bühnen Düsseldorf | 1946 | 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 | |
| Saint Sebastian Players | Saint Sebastian Players | 2024 | 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 | |
| Secret House | Secret House | 2024 | 1 | |
| Suomen Kansallisteatteri | Suomen Kansallisteatteri | 1891 – 2005 | 13 | |
| Städtische Bühnen Frankfurt am Main | Städtische Bühnen Frankfurt am Main | 1937 | 2 | |
| 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 | |
| Shanghai International Studies University | Shanghai International Studies University | 2010 | 1 | |
| SM Arte e Cultura | SM Arte e Cultura | 2024 | 1 | |
| Shanghai Amateur Actors Association | Shanghai Amateur Actors Association | 1934 – 1935 | 2 | |
| Stadttheater Basel | Stadttheater Basel | 1928 – 1930 | 2 | |
| Studio Marta | Studio Marta | 2023 – 2024 | 5 | |
| Stone & Wings | Stone & Wings | 2006 | 1 | |
| StøpeSkien | StøpeSkien | 2003 – 2007 | 62 | |
| Schleswig-Holsteinisches Landestheater und Sinfonieorchester | Schleswig-Holsteinisches Landestheater und Sinfonieorchester | 1976 – 2002 | 12 | |
| Shunjuza | Shunjuza | 1922 | 1 | |
| Speilbilder Teater | Speilbilder Teater | 2011 | 1 | |
| Sixth Festival | The Sixth Festival | 2024 | 1 | |
| Staats-Theater Berlin | Staats-Theater Berlin | 1919 – 1930 | 19 | |
| Solarium Asbl | Solarium Asbl | 2022 | 1 | |
| Städtische Bühnen Freiburg | Städtische Bühnen Freiburg | 1966 | 2 | |
| Storsjöyran-festivalen | Storsjöyran-festivalen | 2000 | 1 | |
| Staatsschauspiel (Ballhof) | Staatsschauspiel (Ballhof) | | | |
| Shingekisha | Shingekisha | 1914 | 1 | |
| Scriblers Dramatic Society, The | The Scriblers Dramatic Society | 1885 | 1 | |
| Slovene National Theatre Nova Gorica | Slovene National Theatre Nova Gorica | 2024 | 1 | |
| Siena College | Siena College | 2023 | 1 | |
| Shared Experience | Shared Experience | 2000 | 8 | |
| Scuola del Musical di Milano | Scuola del Musical di Milano (Milan's Musical School) | 2024 – 2025 | 4 | |
| Sächsische Staatstheater | Sächsische Staatstheater | 1942 | 2 | |
| Stavanger Teaters Orkester | Stavanger Teaters Orkester | 1946 | 1 | |
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