| Sieniawska, Maria | Maria Sieniawska | Actor | 1922 | 1 | |
| Siennicka, Natalia | Natalia Siennicka | Actor | 1920 | 1 | |
| Siennicki, Jan | Jan Siennicki | Actor | 1905 | 1 | |
| Siepl, Travis | Travis Siepl | Stage Manager | 2024 | 1 | |
| Sierck, Hans Detlef | Hans Detlef Sierck | Director | 1923 - 1935 | 3 | |
| Siercke, Alfred | Alfred Siercke | Costume Designer, Designer | 1968 | 2 | |
| Sierra Izquierdo, Abel | Abel Sierra Izquierdo | Actor | 1955 | 1 | |
| Sierra, Dayanna | Dayanna Sierra | Musician | 2001 | 1 | |
| Sierra, Julio, Luna | Julio Luna Sierra | Actor | 1956 | 1 | 1 |
| Sierra, Nicolás, Luna | Nicolás Luna Sierra | Actor | 1956 | 1 | 1 |
| Sies, Paul | Paul Sies | Actor | 2021 | 2 | |
| Siess, Kevin | Kevin Siess | Actor | 2015 | 1 | |
| Sieveking, Alejandro | Alejandro Sieveking | Costume Designer, Director | 1973 | 2 | |
| Sieveking, Margot | Margot Sieveking | Actor | 1928 | 1 | 1 |
| Sieverding, Katharina | Katharina Sieverding | Costume Designer | 1964 | 1 | |
| Sievers, Horst Dieter | Horst Dieter Sievers | Actor | 1968 - 1972 | 2 | |
| Sievers, Kathrin | Kathrin Sievers | Director | 2017 | 1 | |
| Sievers, Ludwig | Ludwig Sievers | Mask Maker | 1956 | 1 | |
| Sievers, Otto | Otto Sievers | Actor | 1932 | 1 | |
| Sievers, Sigrid | Sigrid Sievers | Actor | 1950 | 1 | |
| Sievert, Ludwig | Ludwig Sievert | Designer | 1920 - 1937 | 2 | |
| Sievertsen, Will | Will Sievertsen | Actor | 2016 | 1 | |
| Siewers, Christine | Christine Siewers | Actor | 1861 | 1 | 1 |
| Siewert, Caroline | Caroline Siewert | Actor | 2013 | 1 | |
| Siewert, John | John Siewert | Actor | 2012 | 1 | |
| Siewert, Vicki | Vicki Siewert | Costume Designer | 1964 | 1 | |
| Siewierska, - | - Siewierska | Actor | 1882 | 1 | |
| Sieyum, Mokenen | Mokenen Sieyum | Lighting Designer, Sound Designer | 2009 | 2 | |
| Siff, Maggie | Maggie Siff | Actor | 2005 | 1 | 1 |
| Siffer, Cyrille | Cyrille Siffer | Lighting Designer | 2000 | 1 | |
| Sifonia , Liberato Firmino | Liberato Firmino Sifonia | Composer | 1962 | 1 | |
| Sigaev, Sergey | Sergey Sigaev (Сергей Сигаев) | Actor | 2024 | 1 | |
| Sigaux, Gilbert | Gilbert Sigaux | Adaptation, Translator | 1962 - 1995 | 13 | 1 |
| Sigaux, Henri | Henri Sigaux | Translator | 2007 - 2009 | 10 | |
| Sigbjørnsen, Tor | Tor Sigbjørnsen | Actor | 1985 | 2 | |
| Sigg, Carola | Carola Sigg | Actor | 2009 | 1 | 1 |
| Sigg, Maximilian | Maximilian Sigg | Actor | 1971 - 1973 | 2 | |
| Siggelkow, Bertha | Bertha Siggelkow | Actor | 1898 | 1 | |
| Sigillò, Ester | Ester Sigillò | Actor | 2015 | 2 | |
| Sigl, - | - Sigl | Actor | 1889 | 1 | |
| Sigl, Mr.. | Mr.. Sigl | Actor | 1893 - 1900 | 2 | |
| Sigl, Peter | Peter Sigl | Actor, Director | 1893 - 1902 | 3 | |
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