| Saiko Geijutsuza | Saiko Geijutsuza | 1924 | 1 | |
| Saint Sebastian Players | Saint Sebastian Players | 2024 | 1 | |
| Sala Muzeum Przemysłu i Rolnictwa | Sala Muzeum Przemysłu i Rolnictwa | 1899 | 1 | |
| Sam Wanamaker Playhouse | Sam Wanamaker Playhouse | 2023 – 2024 | 1 | |
| Samina Peerzadas Ensemble | Samina Peerzadas Ensemble | 1992 – 1994 | 2 | |
| Samuel Fröler | Samuel Fröler | 2010 | 1 | |
| Santa Cristina Centro Theatrical | Santa Cristina Centro Theatrical | 2011 | 1 | |
| São João National Theater | São João National Theater | 2021 | 1 | |
| Satirikon | Satirikon (Satyricon) | 2001 | 1 | |
| Scarlet Cup | Scarlet Cup Theatre | 2023 | 1 | |
| Sceneriet | Sceneriet | 2007 | 1 | |
| Scharoun-Theater Wolfsburg | Scharoun-Theater Wolfsburg | 2023 | 6 | |
| Schaubuhne am Lehniner Platz | Schaubühne am Lehniner Platz (Schaubuhne am Lehniner Platz) | 2002 – 2023 | 71 | |
| Schauspiel Bonn | Schauspiel Bonn | 1987 – 2006 | 11 | |
| Schauspielensemble Anklam | Schauspielensemble Anklam | 1969 | 1 | |
| Schleswig-Holsteinisches Landestheater und Sinfonieorchester | Schleswig-Holsteinisches Landestheater und Sinfonieorchester | 1976 – 2002 | 12 | |
| Scotland's National Young People's Theatre Festival | Scotland's National Young People's Theatre Festival | 2010 | 1 | |
| Scribblers Hongkong | Scribblers Hongkong | 2006 | 1 | |
| Scriblers Dramatic Society, The | The Scriblers Dramatic Society | 1885 | 1 | |
| Seattle Repertory Playhouse | Seattle Repertory Playhouse | 1931 – 2022 | 6 | |
| Seattle Repertory Theatre | Seattle Repertory Theatre | 2018 | 1 | |
| Seifi Hashem | Seifi Hashem | 1993 | 1 | |
| Seoul Metropolitan Theater | The Seoul Metropolitan Theater | 2024 | 1 | |
| Shakespeare Playhouse of New York, The | The Shakespeare Playhouse of New York | 1921 | 1 | |
| Shakespeare’s Globe | Shakespeare’s Globe | | | |
| Shanghai Amateur Actors Association | Shanghai Amateur Actors Association | 1934 – 1935 | 2 | |
| Shanghai International Studies University | Shanghai International Studies University | 2010 | 1 | |
| Shanghai Symphony Orchestra | Shanghai Symphony Orchestra | 2007 | 1 | |
| Shared Experience | Shared Experience | 2000 | 8 | |
| Shenzhen Symphony Orchestra | Shenzhen Symphony Orchestra (深圳交响乐团) | 2023 | 1 | |
| Shingekisha | Shingekisha | 1914 | 1 | |
| Shunjuza | Shunjuza | 1922 | 1 | |
| Siegener Biennale | Siegener Biennale | 2012 | 1 | |
| Siena College | Siena College | | 1 | |
| Singapore Arts Festival | Singapore Arts Festival | 2007 | 1 | |
| SISU Finalmente | SISU Finalmente | 2010 | 1 | |
| Sixth Annual Play Festival | Sixth Annual Play Festival | 1937 | 1 | |
| Skandinaviska Gästspelsturneen, Den | Den Skandinaviska Gästspelsturneen | 1890 | 2 | |
| 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 | |
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