| Sinkó, György | György Sinkó | Actor | 1969 | 1 | |
| Sinkó, László | László Sinkó | Actor | 1965 | 2 | |
| Sinkovits, Imre | Imre Sinkovits | Actor | 1958 - 1991 | 4 | |
| Sinn, Gotthard | Gotthard Sinn | Actor | 2003 - 2015 | 12 | 1 |
| Sinn, Jacob | Jacob Sinn | Actor | 1924 - 1946 | 5 | |
| Sinnhold, Rudolf | Rudolf Sinnhold | Actor | 1889 | 1 | |
| Sinober, Aila | Aila Sinober | Actor | 2020 - 2022 | 2 | |
| Sinovčić, Snježana | Snježana Sinovčić | Actor | 2017 | 1 | |
| Sintado, Myriam | Myriam Sintado | Actor | 2008 | 8 | |
| Sion, George | George Sion | Actor | 1944 | 1 | |
| Siopkas, Antonis | Antonis Siopkas | Actor | 1992 | 1 | |
| Siourouni, Maria | Maria Siourouni | Actor | 1984 | 1 | |
| Sioútis, Sákis | Sákis Sioútis (Σάκης Σιούτης) | Actor | 2023 | 2 | |
| Sipaitis, Saulius | Saulius Sipaitis | Actor | 2006 - 2007 | 2 | |
| Sipari, Lauri | Lauri Sipari | Adaptation, Translator | 1969 - 2008 | 25 | 1 |
| Sipe, Parker | Parker Sipe | Actor | 1996 | 1 | |
| Sipilä, Hilma | Hilma Sipilä | Actor | 1922 | 1 | |
| Sipilä, Jari | Jari Sipilä | Lighting Designer | 2006 | 1 | |
| Sipos, András | András Sipos | Actor | 1989 | 1 | |
| Sipos, Gyôrgy | Gyôrgy Sipos | Actor | 2019 - 2020 | 2 | |
| Sipos, Sabine | Sabine Sipos | Actor | 1993 | 1 | |
| Siposné, - | - Siposné | Actor | 1879 | 1 | |
| Sippel, Peter | Peter Sippel | Lighting Designer | 2013 | 1 | |
| Sippo, Gints | Gints Sippo | Designer | 2005 - 2008 | 5 | |
| Sira, Adrian | Adrian Sira | Dancer | 2010 | 1 | |
| Siraste, Kirsti | Kirsti Siraste | Translator | 1980 | 1 | |
| Sîrbu, George | George Sîrbu | Actor | 1963 | 2 | |
| Sire, Agustin | Agustin Sire | Actor, Director, Translator | 1956 - 1962 | 3 | 1 |
| Sire, Nicolas | Nicolas Sire | Designer | 1991 | 1 | |
| Sirekova, Sonja | Sonja Sirekova | Actor | 1936 | 1 | |
| Siren, Markku | Markku Siren | Costume Designer, Designer | 1979 - 2006 | 4 | |
| Sirén, Mitja | Mitja Sirén | Actor | 2001 | 7 | |
| Sirén, Pehr-Olof | Pehr-Olof Sirén | Actor | 1962 | 1 | |
| Sirera, Rodolf | Rodolf Sirera | Translator | 1981 - 2006 | 36 | |
| Sireteanu, Andrei | Andrei Sireteanu | Director | 1979 | 1 | |
| Sireteanu, Nicolae | Nicolae Sireteanu | Actor | 1934 | 1 | |
| Sireteanu, Ruxandra | Ruxandra Sireteanu | Actor | 1984 - 2013 | 2 | |
| Sirett, Karen | Karen Sirett | Actor | 1972 | 1 | |
| Sireuil, Sireuil | Sireuil Sireuil | Director, Lighting Designer | 2002 - 2004 | 10 | |
| Sireyzol, Christine | Christine Sireyzol | Actor | 1995 | 1 | |
| Sirge, Peeter | Peeter Sirge | Photographer | 1989 | 1 | |
| Siripan, Somsak | Somsak Siripan | Actor | 2005 | 5 | |
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