| Sixty, Antonio | Antonio Sixty | Director | 2006 | 1 | |
| Supino, Gianni | Gianni Supino | Director | 1975 | 1 | |
| Salessi, Lucilla | Lucilla Salessi | Actor | 1980 | 3 | |
| Spiteri, Simone | Simone Spiteri | Translator | 2024 | 1 | |
| Spiteri, Cassandra | Cassandra Spiteri | Actor | 2024 | 1 | |
| Salotti, Marco | Marco Salotti | Adaptation, Designer | 2006 | 2 | |
| Sorichetti, Francesco | Francesco Sorichetti | Actor | 2006 | 1 | |
| Serrano, Beatriz | Beatriz Serrano | Actor | 2024 | 1 | |
| Stratikopoulou, Dimitra | Dimitra Stratikopoulou | Assistant Director, Dramaturg | 2024 | 3 | |
| Soldateschi, Cristian | Cristian Soldateschi | Lighting Designer | 2003 | 1 | |
| Secondi, Massimo | Massimo Secondi | Actor | 2015 | 1 | |
| Salomon, Paola | Paola Salomon | Costume Designer, Designer | 2022 | 2 | |
| Sala, Mario | Mario Sala | Actor | 2008 | 1 | |
| Scalera, Vanessa | Vanessa Scalera | Actor | 2012 | 2 | |
| Sifonia , Liberato Firmino | Liberato Firmino Sifonia | Composer | 1962 | 1 | |
| Spaziani, Serena | Serena Spaziani | Actor | 1962 | 1 | |
| Sora, Claudio | Claudio Sora | Actor | 1962 | 1 | |
| Silvani, Aldo | Aldo Silvani | Actor | 1956 | 1 | |
| Sanchez, Eduardo Romero | Eduardo Romero Sanchez | Lighting Designer, Sound Designer, Stage Manager | 2022 - 2025 | 33 | |
| Schlappig, Markus Sascha | Markus Sascha Schlappig | Assistant Director | 2019 | 1 | |
| Stuart, Mary | Mary Stuart | Actor | 1897 | 1 | |
| Salvo, Nicola | Nicola Salvo | Lighting Designer, Sound Designer | 2017 | 2 | |
| Strino, Luigi | Luigi Strino | Video Designer | 2017 | 1 | |
| Scott, Alice | Alice Scott | Actor | 1897 | 1 | |
| St. John, Rossie | Rossie St. John | Actor | 1897 | 1 | |
| St. John, Maisie | Maisie St. John | Actor | 1897 | 3 | |
| Stroppiana, Domenico | Domenico Stroppiana | Actor | 2018 | 1 | |
| Shakya, Nanaji | Nanaji Shakya | Actor | 2018 | 1 | |
| Sigillò, Ester | Ester Sigillò | Actor | 2015 | 2 | |
| Sacchetti, Maria Paola | Maria Paola Sacchetti | Actor, Director | 1997 - 2019 | 4 | |
| Scelsi, Lorenzo | Lorenzo Scelsi | Designer | 2019 | 1 | |
| Sechi, Naika | Naika Sechi | Assistant Director | 2022 - 2023 | 5 | |
| Sicuranza, Giuliana | Giuliana Sicuranza | Actor | 1997 | 1 | |
| Sieghi, Alessandro | Alessandro Sieghi | Actor | 1997 | 1 | |
| Sarti, Rosa | Rosa Sarti | Actor | 1999 | 1 | |
| Sabatini, Andrea | Andrea Sabatini | Actor | 2006 | 1 | |
| Shaikhudinova, Valeria | Valeria Shaikhudinova (Валерия Шайхудинова) | Actor | 2024 | 1 | |
| Stefanini, Alessandro | Alessandro Stefanini | Actor | 2018 | 1 | |
| Sigaev, Sergey | Sergey Sigaev (Сергей Сигаев) | Actor | 2024 | 1 | |
| Sarnelli, Costantino | Costantino Sarnelli | Director | 2013 | 4 | |
| Siniscalco, Giovanni Maria | Giovanni Maria Siniscalco | Actor, Director | 2021 - 2024 | 4 | |
| Scarpati Fanetti, Emilia | Emilia Scarpati Fanetti | Actor | 2014 | 3 | |
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