| Kourtaki, Dioni | Dioni Kourtaki | Actor | 2014 | 1 | |
| Kaletsanos, Ieronimos | Ieronimos Kaletsanos | Actor | 2014 - 2023 | 6 | |
| Kyrgia, Eri | Eri Kyrgia | Adaptation, Dramaturg, Translator | 2012 - 2023 | 12 | |
| Karch, Matthias | Matthias Karch | Designer | 1994 | 1 | |
| Karger, Reinhard | Reinhard Karger | Musical Director | 1994 | 1 | |
| Koritzinsky, Marianne | Marianne Koritzinsky | Actor | 1980 | 1 | |
| Kittelsen, Guttorm | Guttorm Kittelsen | Musician | 1980 | 1 | |
| Kolar, Helmuth | Helmuth Kolar | Actor | 1971 - 1980 | 2 | |
| Kallio, Pentti | Pentti Kallio | Actor | 1980 | 1 | |
| Kuosmanen, Martti | Martti Kuosmanen | Actor | 1980 | 1 | |
| Konu, Leo | Leo Konu | Actor | 1980 | 1 | |
| Kinnari, Irene | Irene Kinnari | Actor, Costume Designer | 1980 | 2 | |
| Kramer, Gregory, C. | Gregory C. Kramer | Actor | 1980 | 1 | |
| Kinney, Terry | Terry Kinney | Actor | 1980 | 2 | |
| Kennedy, Dennis | Dennis Kennedy | Actor | 1980 | 1 | |
| Kahn, Robert | Robert Kahn | Actor | 1980 | 1 | |
| Kydd, David, W | David W Kydd | Lighting Designer | 2011 | 1 | |
| Komi, Soila | Soila Komi | Actor | 1967 - 2005 | 4 | |
| Kelly, David, Blake | David Blake Kelly | Actor | 1980 | 1 | |
| Kamifuku, Koki | Koki Kamifuku | Actor | 1994 | 1 | |
| Kaye, Carol | Carol Kaye | Actor | 1980 | 1 | |
| Keeler, Melissa | Melissa Keeler | Actor | 1980 | 1 | |
| Keller, Ron | Ron Keller | Designer | 1980 | 1 | |
| Kurasaki, Seiji | Seiji Kurasaki | Actor | 1994 | 1 | |
| Kunkel, Herbert | Herbert Kunkel | Actor | 1980 | 1 | |
| Kotrbová, Jorga | Jorga Kotrbová | Actor | 1980 - 2000 | 2 | |
| Kaňkovský, Václav | Václav Kaňkovský | Actor | 1979 - 2000 | 3 | |
| Komárek, Tomáš | Tomáš Komárek | Actor | 1993 - 1997 | 7 | |
| Kouřilová, Dagmar | Dagmar Kouřilová | Actor | 1994 - 1997 | 2 | |
| Kotva, Václav | Václav Kotva | Actor | 1994 - 1997 | 2 | |
| Kodetová, Barbara | Barbara Kodetová | Actor | 1994 - 1997 | 2 | |
| Koolish, Lynn | Lynn Koolish | Lighting Designer | 1980 | 1 | |
| Koefoed, Henrik | Henrik Koefoed | Actor | 1980 | 1 | |
| Koning, Matthias de | Matthias de Koning | Actor | 1994 | 1 | |
| Kress, Heidelore | Heidelore Kress | Actor | 1994 | 1 | |
| Krumbein, Kathrin | Kathrin Krumbein | Actor, Costume Designer, Designer | 1994 - 2006 | 7 | |
| Kairisa, Astrida | Astrida Kairisa | Actor | 1994 - 2010 | 3 | |
| Królikowski, Rafał | Rafał Królikowski | Actor | 1995 | 1 | |
| Kleppe, Marius | Marius Kleppe | Actor | 1997 | 1 | |
| Kuisma, Katariina | Katariina Kuisma | Actor, Dancer | 1994 | 3 | |
| Katajavuori, Esa | Esa Katajavuori | Conductor | 1994 | 1 | |
| Karge, Jessica | Jessica Karge | Costume Designer | 1994 - 2018 | 3 | |
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