| Koch, Eik | Eik Koch | Actor, Director | 1956 - 1964 | 2 | |
| Keller, Gert | Gert Keller | Director | 1964 | 1 | |
| Köhnke, Horst | Horst Köhnke | Actor | 1964 | 1 | |
| Koppel, Herman, D. | Herman D. Koppel | Composer, Conductor | 1964 | 2 | |
| Kløvtvedt, Kaare | Kaare Kløvtvedt | Actor | 1962 - 1963 | 58 | |
| Knight, Alan | Alan Knight | Actor | 1963 | 1 | |
| Karantzas, Dimitris | Dimitris Karantzas (Δημήτρης Καραντζάς) | Director | 2012 - 2025 | 3 | |
| Koukios, Thymios | Thymios Koukios | Actor | 2012 | 1 | |
| Kropf, Robert | Robert Kropf | Actor, Adaptation, Designer, Director | 2012 - 2017 | 5 | |
| Kozar, Daniel | Daniel Kozar | Costume Designer | 2012 | 1 | |
| Kerbel, Jens | Jens Kerbel | Director | 2012 | 1 | |
| Karkoff, Maurice | Maurice Karkoff | Composer | 1963 | 1 | |
| Kautzner, Dieter | Dieter Kautzner | Actor | 1963 | 1 | |
| Kochery, Timothy | Timothy Kochery | Actor | 1963 | 1 | |
| Krysiak, Joseph, J. | Joseph J. Krysiak | Actor | 1963 | 1 | |
| Kidwell, Erin | Erin Kidwell | Actor | 2016 - 2020 | 2 | |
| Kenyon, Shane | Shane Kenyon | Actor | 2016 | 1 | |
| Kling, Kris | Kris Kling | Actor | 2013 - 2016 | 2 | |
| Klante, Paul | Paul Klante | Actor | 1922 | 1 | |
| König, Käte | Käte König | Actor | 1922 | 1 | |
| Keene, Jay, B. | Jay B. Keene | Designer, Lighting Designer | 1963 | 2 | |
| Kunrad, Aladar | Aladar Kunrad | Actor | 1963 | 1 | |
| Kranz, Mario | Mario Kranz | Actor | 1953 - 1964 | 5 | |
| Kitamura, Eizo | Eizo Kitamura | Director | 1963 | 1 | |
| Krigsvoll, Anders | Anders Krigsvoll | Designer | 1963 | 1 | |
| Kudakwashe, Michael | Michael Kudakwashe | Actor | 2015 - 2016 | 2 | |
| Kieling, Wolfgang | Wolfgang Kieling | Actor | 1963 - 1964 | 2 | |
| King, Thomas | Thomas King | Actor | 1963 | 1 | |
| Kettner, Ingeborg | Ingeborg Kettner | Costume Designer | 1963 | 1 | |
| Kloiber, Ingeborg | Ingeborg Kloiber | Actor | 1963 | 1 | |
| Kinnard, Bob | Bob Kinnard | Actor | 1963 | 1 | |
| Knight, Esmond | Esmond Knight | Actor | 1961 - 1962 | 6 | |
| Kurist, Helmut | Helmut Kurist | Lighting Designer | 1962 | 1 | |
| King, Arlene | Arlene King | Actor | 1962 | 1 | |
| Kouli, Nina | Nina Kouli | Actor | 1962 | 1 | |
| Kreyer, Herbert | Herbert Kreyer | Mask Maker | 1962 | 1 | |
| Kerry, James | James Kerry | Actor | 1962 | 4 | |
| Kavvadia, Taso | Taso Kavvadia | Actor | 1962 | 1 | |
| Karettas, Giorgos | Giorgos Karettas | Actor | 1962 | 1 | |
| Karlsen, Tor | Tor Karlsen | Actor | 1962 - 1965 | 4 | |
| Kuosmanen, Mirjami | Mirjami Kuosmanen | Actor | 1962 | 1 | |
| Kolehmainen, Seppo | Seppo Kolehmainen | Actor | 1962 | 1 | |
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