| Suomalainen Teatteri | Suomalainen Teatteri | Finland, Helsinki, 1 Läntinen Teatterikuja | 1880-02-25 | -- | 1880–1930 | 24 | 1 |
| Suomen Kansallisteatteri | Suomen Kansallisteatteri | Finland, Helsinki, 1 Läntinen Teatterikuja | 1891-- | 2008-05-24 | 1891–2014 | 35 | |
| Suomen Työväen Teatteri | Suomen Työväen Teatteri | Finland, Helsinki | 1949-11-12 | -- | 1949 | 1 | |
| Sininen Teatteri | Sininen Teatteri | Finland, Helsinki | 2006-11-02 | 2006-12-16 | 2006 | 1 | |
| Sääksmäki | Sääksmäki | Finland | -- | -- | | | |
| Stadttheater Dorpat | Stadttheater Dorpat | Estonia, Tartu | 1892-08-11 | -- | 1892 | 1 | |
| Stadttheater Reval | Stadttheater Reval | Estonia, Tallinn | 1902-01-21 | -- | 1902 | 2 | |
| Swan Theatre | Swan Theatre | England, Worcester, Worcestershire, The Moors | 2003-10-16 | 2003-10-25 | 2003 | 1 | |
| Stoke St. Gregory Village Hall | Stoke St. Gregory Village Hall | England, Taunton | 2008-04-05 | -- | 2008 | 1 | |
| Swindon Arts Centre | Swindon Arts Centre | England, Swindon, Devizes Rd | 2013-10-04 | -- | 2013–2017 | 2 | |
| Stage Sixty at the Theatre Royal Stratford | Stage Sixty at the Theatre Royal Stratford | England, Stratford, London | 1965-04-06 | -- | 1965 | 1 | |
| Swan Theatre, The | The Swan Theatre | England, Stratford-upon-Avon, Warwickshire, Waterside | 1994-04-27 | 2003-05-24 | 1994–2003 | 3 | |
| Savoy Theatre | Savoy Theatre | England, Strand, London, Savoy Court | 1914-01- | -- | 1914 | 1 | |
| Stoke on Trent Repertory Theatre | Stoke on Trent Repertory Theatre | England, Stoke-on-Trent, Leek Rd | 2007-04-17 | 2007-04-28 | 2007 | 1 | |
| Stamford Arts Centre | Stamford Arts Centre | England, Stamford, Lincolnshire, 27 St Mary's St | 1985-02-16 | -- | 1985–2018 | 3 | |
| Stafford Gatehouse | Stafford Gatehouse | England, Stafford, Eastgate St | 2014-03-22 | -- | 2014 | 1 | |
| St Leonards Palace Pier | St Leonards Palace Pier | England, St Leonards-on-Sea | 1913-07-21 | -- | 1913 | 1 | |
| Southport | Southport | England, Southport | -- | -- | | | |
| Southall | Southall | England, Southall | -- | -- | | | |
| Sheringham Little Theatre | Sheringham Little Theatre | England, Sheringham, 2 Station Rd | 2004-04-22 | 2004-04-24 | 2004 | 1 | |
| South Street Hall | South Street Hall | England, Sheffield | 1928-04-16 | -- | 1928 | 1 | |
| Saltash.net Community School | Saltash.net Community School | England, Saltash, Wearde Rd, | 2013-10-08 | 2013-10-09 | 2013 | 1 | |
| Salisbury Playhouse | Salisbury Playhouse | England, Salisbury, Malthouse Lane | 2013-10-15 | 2018-10-27 | 2013–2018 | 3 | |
| Studio Theatre | Studio Theatre | England, Salisbury | 2023-05-22 | 2023-05-27 | 2023 | 1 | |
| South Street Arts Centre | South Street Arts Centre | England, Reading, 21 South St | 2018-10-10 | -- | 2018 | 1 | |
| South Parade Pier | South Parade Pier | England, Portsmouth | 1911-02-06 | 1911-04-01 | 1911 | 5 | |
| Stahl Theatre | Stahl Theatre | England, Oundle, West Street | 1985-02-01 | 2013-09-20 | 1985–2018 | 5 | |
| Socialist Hall, Royal Arcade | Socialist Hall, Royal Arcade | England, Newcastle upon Tyne, Pilgrim Street | 1922-10-21 | 1922-10-28 | 1922 | 1 | |
| Stantonbury Theatre | Stantonbury Theatre | England, Milton Keynes, Stantonbury | 2014-03-14 | 2018-10-23 | 2014–2018 | 4 | |
| Stables | Up at the Stables, Manchester | England, Manchester | 1974-05-13 | 1974-05-18 | 1974 | 1 | |
| Seagull Theatre, The | The Seagull Theatre | England, Lowestoft, 19-75 Morton Road | 2005-02-04 | 2005-02-05 | 2005–2010 | 2 | |
| St. Martin's Theatre | St. Martin's Theatre | England, London, West St | 1917-06-05 | -- | 1917–1964 | 3 | |
| Soho theatre | Soho Theatre | England, London, Soho Theatre Company Ltd 21 Dean Street | 2022-02-04 | 2022-03-13 | 2022 | 1 | |
| Southwark Playhouse | Southwark Playhouse | England, London, Shipwright Yard, Corner of Tooley St & Bermondsey St | 2003-11-04 | 2011-04-23 | 2003–2011 | 2 | |
| Sadler's Wells | Sadler's Wells | England, London, Rosebery Ave | 1936-05-05 | -- | 1936 | 1 | |
| St. George's Hall | St. George's Hall | England, London, Regent Street | 1900-10-05 | -- | 1900–1901 | 2 | |
| St. James Theatre | St. James Theatre | England, London, King Street | 1913-12-01 | -- | 1913–1925 | 3 | |
| Scala Theatre | Scala Theatre | England, London, Charlotte Street | 1906-01-28 | 1906-01-29 | 1906 | 1 | |
| School Of Dramatic Art | School Of Dramatic Art | England, London, 4 Bute Street | 1885-03-25 | 1885-03-26 | 1885 | 1 | |
| Space, The | The Space | England, London, 269 Westferry Road | 2010-11-24 | 2023-07-08 | 2010–2023 | 4 | |
| Sutton House | Sutton House | England, London, 2 and 4 Homerton High Street, Hackney | 2014-03-17 | 2014-03-20 | 2014 | 1 | |
| Saville Theatre | Saville Theatre | England, London, 135 Shaftesbury Avenue | 1955-12-21 | 1956-02-18 | 1955 | 1 | |
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