| Siegener Biennale | Siegener Biennale | 2012 | 1 | |
| Siena College | Siena College | | 1 | |
| Samina Peerzadas Ensemble | Samina Peerzadas Ensemble | 1992 – 1994 | 2 | |
| Städtische Schauspiele Baden-Baden | Städtische Schauspiele Baden-Baden | 1919 | 13 | |
| 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 | |
| Skuespillerlinjen | Skuespillerlinjen | 1992 | 1 | |
| Sladký časy | Sladký časy (Sweet times) | 2023 | 1 | |
| Svenska Inhemska Teatern | Svenska Inhemska Teatern | 1897 | 5 | |
| 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 | |
| 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 | |
| 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 | |
| Station Noord | Station Noord | 2022 | 1 | |
| Sydney Opera House Trust | Sydney Opera House Trust | 1976 | 1 | |
| 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 | |
| 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 | |
| Sam Wanamaker Playhouse | Sam Wanamaker Playhouse | 2023 – 2024 | 1 | |
| Städtische Theater Leipzig | Städtische Theater Leipzig | 1913 – 1928 | 40 | |
| SYV MIL | SYV MIL | 2024 | 1 | |
| Speilbilder Teater | Speilbilder Teater | 2011 | 1 | |
| Shanghai Amateur Actors Association | Shanghai Amateur Actors Association | 1934 – 1935 | 2 | |
| Stadttheater Basel | Stadttheater Basel | 1928 – 1930 | 2 | |
| 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 | |
| Scriblers Dramatic Society, The | The Scriblers Dramatic Society | 1885 | 1 | |
| Scharoun-Theater Wolfsburg | Scharoun-Theater Wolfsburg | 2023 | 6 | |
| Shared Experience | Shared Experience | 2000 | 8 | |
| Staats-Theater Berlin | Staats-Theater Berlin | 1919 – 1930 | 19 | |
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