| Kos, Boštjan | Boštjan Kos | Lighting Designer | 2014 - 2015 | 2 | |
| Kerch, Boris | Boris Kerč | Actor | 2014 - 2015 | 2 | |
| Karagiannopoulou, Athanasia | Athanasia Karagiannopoulou | Adaptation, Director | 2019 | 2 | |
| Kutakov, V. | V. Kutakov | Actor | 1970 - 1990 | 2 | |
| Kassis, José Luis | José Luis Kassis | Actor | 2004 | 2 | |
| Klainer, Sergio | Sergio Klainer | Actor | 1980 - 1994 | 2 | |
| Klamar, Natalie | Natalie Klamar | Actor | 2020 - 2023 | 2 | |
| Kay, Jonathan | Jonathan Kay | Actor | 2020 | 2 | |
| Kirkene, Evangelia | Evangelia Kirkene | Costume Designer, Designer | 2020 | 2 | |
| Karetnikov, Nikolaj | Nikolaj Karetnikov | Composer | 1979 - 1981 | 2 | |
| Krasnov, Leonid | Leonid Krasnov | Actor, Director | 2009 | 2 | |
| König, Michael | Michael König | Actor | 2017 - 2023 | 2 | |
| Kilyén, László | László Kilyén | Actor | 2019 | 2 | |
| Keramatloo, Fatemeh | Fatemeh Keramatloo | Actor | 2018 - 2020 | 2 | |
| Karimi | Saeid | Dramaturg, Lighting Designer | 2018 | 2 | |
| Kumar, Mihir | Mihir Kumar | Actor | 2020 - 2022 | 2 | |
| Kent, Rebecca | Rebecca Kent | Actor | 2020 - 2022 | 2 | |
| Kinz, Franziska | Franziska Kinz | Actor | 1937 - 1944 | 2 | |
| Kirigin, Zdravka Ivandija | Zdravka Ivandija Kirigin | Costume Designer, Designer | 2014 - 2021 | 2 | |
| Kérien, Jean-Pierre | Jean-Pierre Kérien | Actor | 1935 | 2 | |
| Kaced, Anne-Marie | Anne-Marie Kaced | Actor | 2014 | 2 | |
| Kaced, Jean-Luc | Jean-Luc Kaced | Actor | 2014 | 2 | |
| Kokamägi, Epp-Maria | Epp-Maria Kokamägi | Costume Designer, Designer | 1989 | 2 | |
| Kleinermann, Charly | Charly Kleinermann | Designer, Set Designer | 2021 - 2023 | 2 | |
| Kestelman, Sara | Sara Kestelman | Actor | 1972 | 2 | |
| Kelleher, Devon | Devon Kelleher | Actor, Director | 2022 | 2 | |
| Krsmanović, Asja | Asja Krsmanović | Adaptation, Dramaturg | 2022 | 2 | |
| Kelch, Hunter | Hunter Kelch | Actor | | 2 | |
| Knox, Campbell | Campbell Knox | Actor, Assistant Director | 2020 - 2022 | 2 | |
| King, Hannah | Hannah King | Actor | 2020 - 2022 | 2 | |
| Kumbaro, Arben | Arben Kumbaro (Арбен Кумбаро) | Adaptation, Director | 2022 | 2 | |
| Krapi, Besnik | Besnik Krapi | Actor | 2014 | 2 | |
| Kaludova, Nevena | Nevena Kaludova (Невена Калудова) | Actor | 2022 - 2023 | 2 | |
| Kelln, Mya | Mya Kelln | Director | 2023 - 2024 | 2 | |
| Kato, Yukio | Yukio Kato (加藤幸夫) | Actor | 2023 | 2 | |
| Komai, Yumiko | Yumiko Komai (駒井友美子) | Costume Designer | 2023 | 2 | |
| Kajita, Kyoko | Kyoko Kajita (秡川幸雄) | Stage Manager | 2023 | 2 | |
| Kobayakawa, Hiroya | Hiroya Kobayakawa (小早川洋也) | Lighting Designer | 2023 | 2 | |
| Kulyabin, Timofey Aleksandrovich | Timofey Aleksandrovich Kulyabin (Тимофей Александрович Кулябин) | Director | 2021 | 2 | |
| Kougia, Anda | Anda Kougia (Άντα Κουγιά) | Actor | 2023 | 2 | |
| Kaldoja, Lauri | Lauri Kaldoja | Actor, Sound Designer | 2019 | 2 | |
| Krouskas, Stella | Stella Krouskas | Actor, Musical Director | | 2 | |
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