| Siekmann, Dora | Dora Siekmann | Actor | 1937 | 3 | |
| Siekkinen, Ritva | Ritva Siekkinen | Costume Designer | 1983 | 1 | |
| Siekierski, Stanisław | Stanisław Siekierski | Actor | 1972 | 1 | |
| Siegumfeldt, Søren | Søren Siegumfeldt | Composer | 2001 - 2013 | 2 | |
| Siegrot, Anna | Anna Siegrot | Designer | 2001 - 2003 | 40 | |
| Siegrist, Ulrike | Ulrike Siegrist | Designer | 2003 | 2 | 1 |
| Siegrist, Philipp | Philipp Siegrist | Actor | 1891 | 1 | |
| Siegrist, Evelyne | Evelyne Siegrist | Actor | 1998 | 1 | |
| Siegrist, Beat | Beat Siegrist | Actor | 1995 | 3 | |
| Siegoczyński, Michał | Michał Siegoczyński | Director | 2012 | 1 | |
| Siegmund, Siegfried | Siegfried Siegmund | Actor | 1975 | 1 | |
| Siegmund, Paul | Paul Siegmund | Actor | 1942 | 1 | |
| Siegmund, Margarita | Margarita Siegmund | Actor | 2005 - 2006 | 4 | |
| Siegmann, M. | M. Siegmann | Actor | 1889 | 2 | |
| Siegmann, Herr | Herr Siegmann | Actor | 1878 | 1 | |
| Siegmann, George | George Siegmann | Assistant Director | 1915 | 1 | |
| Siegman, Simon | Simon Siegman | Set Designer | 2024 | 1 | |
| Sieglin, Antje Charlotte | Antje Charlotte Sieglin | Actor | 2004 | 5 | |
| Siegler, Ned | Ned Siegler | Actor | 1971 | 1 | |
| Siegler, F.M. | F. M. Siegler (F.M. Siegler) | Actor | 1909 | 1 | |
| Siegler, Ellery | Ellery Siegler | Actor | 1971 | 1 | |
| Siegl, Renate | Renate Siegl | Actor | 1970 | 1 | |
| Siegl, Mr. | Mr. Siegl | Actor | 1889 | 1 | |
| Siegl, Hannes | Hannes Siegl | Actor | 1981 | 1 | |
| Siegl, Bernhard | Bernhard Siegl | Costume Designer, Designer | 2013 | 2 | |
| Sieghi, Alessandro | Alessandro Sieghi | Actor | 1997 | 1 | |
| Siegert, Werner | Werner Siegert | Actor | 1932 | 2 | |
| Siegert, Reinhold | Reinhold Siegert | Actor | 1931 - 1960 | 9 | |
| Siegert, Kristin | Kristin Siegert | Actor | 2014 | 1 | |
| Siegert, Käthe | Käthe Siegert | Actor | 1939 | 1 | |
| Siegert, Justin | Justin Siegert | Actor | 2006 | 5 | |
| Siegert, Hans | Hans Siegert | Designer | 1940 | 1 | |
| Siegert, Frk. | Frk. Siegert | Actor | 1900 - 1910 | 3 | |
| Siegert, Cordy | Cordy Siegert | Actor | 1910 | 1 | |
| Siegerstetter, Charlotte | Charlotte Siegerstetter | Director | 2010 | 5 | |
| Sieger, Gustl | Gustl Sieger | Actor | 1916 - 1933 | 4 | |
| Siegenthaler, Pierre | Pierre Siegenthaler | Actor | 2010 | 1 | |
| Siegenthaler, Peter | Peter Siegenthaler | Actor | 1974 - 1999 | 3 | 1 |
| Siegel, Walter | Walter Siegel | Actor | 1958 | 1 | |
| Siegel, Martin | Martin Siegel | Musician | 1972 | 1 | |
| Siegel, Jessica | Jessica Siegel | Actor | 2003 | 1 | |
| Siegel, Elliott | Elliott Siegel | Sound Designer | 1995 | 1 | |
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