| Siegl, Mr. | Mr. Siegl | Actor | 1889 | 1 | |
| Siegl, Renate | Renate Siegl | Actor | 1970 | 1 | |
| Siegler, Ellery | Ellery Siegler | Actor | 1971 | 1 | |
| Siegler, F.M. | F. M. Siegler (F.M. Siegler) | Actor | 1909 | 1 | |
| Siegler, Ned | Ned Siegler | Actor | 1971 | 1 | |
| Sieglin, Antje Charlotte | Antje Charlotte Sieglin | Actor | 2004 | 5 | |
| Siegman, Simon | Simon Siegman | Set Designer | 2024 | 1 | |
| Siegmann, George | George Siegmann | Assistant Director | 1915 | 1 | |
| Siegmann, Herr | Herr Siegmann | Actor | 1878 | 1 | |
| Siegmann, M. | M. Siegmann | Actor | 1889 | 2 | |
| Siegmund, Margarita | Margarita Siegmund | Actor | 2005 - 2006 | 4 | |
| Siegmund, Paul | Paul Siegmund | Actor | 1942 | 1 | |
| Siegmund, Siegfried | Siegfried Siegmund | Actor | 1975 | 1 | |
| Siegoczyński, Michał | Michał Siegoczyński | Director | 2012 | 1 | |
| Siegrist, Beat | Beat Siegrist | Actor | 1995 | 3 | |
| Siegrist, Evelyne | Evelyne Siegrist | Actor | 1998 | 1 | |
| Siegrist, Philipp | Philipp Siegrist | Actor | 1891 | 1 | |
| Siegrist, Ulrike | Ulrike Siegrist | Designer | 2003 | 2 | 1 |
| Siegrot, Anna | Anna Siegrot | Designer | 2001 - 2003 | 40 | |
| Siegumfeldt, Søren | Søren Siegumfeldt | Composer | 2001 - 2013 | 2 | |
| Siekierski, Stanisław | Stanisław Siekierski | Actor | 1972 | 1 | |
| Siekkinen, Ritva | Ritva Siekkinen | Costume Designer | 1983 | 1 | |
| Siekmann, Dora | Dora Siekmann | Actor | 1937 | 3 | |
| Siel, Ted | Ted Siel | Dancer | 1939 | 1 | |
| Sielken, Robert | Robert Sielken | Designer, Lighting Designer | 1963 | 2 | |
| Siem, Gitte | Gitte Siem | Actor | 1993 | 4 | |
| Siemaszko, Antoni | Antoni Siemaszko | Actor | 1898 - 1918 | 4 | |
| Siemaszková, Wanda | Wanda Siemaszková | Actor | 1905 - 1911 | 8 | |
| Siemaszkowa, Wanda | Wanda Siemaszkowa | Actor, Director | 1899 - 1946 | 47 | 1 |
| Siemers, Friedrich | Friedrich Siemers | Actor | 1960 | 1 | |
| Siemietowsi, Steven | Steven Siemietowsi | Director | 2018 | 1 | |
| Siemon, Lisa | Lisa Siemon | Actor | 1926 | 2 | |
| Siemon, Maria | Maria Siemon | Actor | 1943 - 1954 | 4 | |
| Siemonsen, Sven | Sven Siemonsen | Actor | 2006 | 2 | 3 |
| Siems, Friedrich | Friedrich Siems | Actor, Director | 1921 - 1938 | 3 | |
| Siemsen, Herbert | Herbert Siemsen | Actor | 1925 | 1 | |
| Siemund, Christine | Christine Siemund | Actor | 2001 - 2002 | 2 | |
| Siener, Antonie | Antonie Siener | Actor | 1933 | 2 | |
| 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 | |
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