| Keating, Thomas | Thomas Keating | Actor | 2002 | 6 | |
| Kim, Ji-Young | Ji-Young Kim | Actor | 2002 | 12 | |
| Kendrick Smith, Lucy | Lucy Kendrick Smith | Actor | 2002 | 7 | |
| Kalas, Janet | Janet Kalas | Sound Designer | 2002 | 1 | |
| Kahre, Andreas | Andreas Kahre | Designer | 2002 | 1 | |
| Kirkpatrick, Helen | Helen Kirkpatrick | Actor | 2002 | 1 | |
| Kačalina, Elena | Elena Kačalina | Actor | 2002 - 2004 | 2 | |
| Koležnik, Mateja | Mateja Koležnik | Director | 2002 - 2018 | 8 | |
| Koležnik, Andrej | Andrej Koležnik | Lighting Designer | 2002 | 1 | |
| Kalan, Sašo | Sašo Kalan | Sound Designer | 2000 - 2002 | 2 | |
| Kin, Rami | Rami Kin | Actor | 1997 | 1 | |
| Kikuchi, Takahiro | Takahiro Kikuchi | Actor | 1997 | 1 | |
| Kohler, Miriam | Miriam Kohler | Actor | 1997 | 1 | |
| Kozłowski, Piotr | Piotr Kozłowski | Actor | 1997 | 1 | |
| Kirin, Mr. | Mr. Kirin | Actor | 1888 - 1894 | 2 | |
| Kokotović, Nikola | Nikola Kokotović | Translator | 1888 - 1952 | 6 | |
| Kubran, Martin | Martin Kubran | Dramaturg | 2013 - 2015 | 2 | |
| Kézdi, Imola | Imola Kézdi | Actor | 2012 - 2017 | 7 | |
| Kedvek, Richárd | Richárd Kedvek | Actor | 2012 | 2 | |
| Kőrösi, István | István Kőrösi | Actor | 2013 | 1 | |
| Krizsán, Szilvia | Szilvia Krizsán | Actor | 2013 | 1 | |
| Kristoffersen, Svenn Erik | Svenn Erik Kristoffersen | Musician | 1989 | 1 | |
| Kayser, Dolly | Dolly Kayser | Actor | 1989 | 1 | |
| Komárková, Adéla | Adéla Komárková | Actor | 2002 | 1 | |
| Koula, Kamil | Kamil Koula | Actor | 2002 | 2 | |
| Kunc, Marek | Marek Kunc | Actor | 2002 | 3 | |
| Klemens, Václav | Václav Klemens | Adaptation, Director | 2002 | 2 | |
| Král, Darek | Darek Král | Composer | 2002 | 1 | |
| Koltay, Gyula | Gyula Koltay | Actor | 1929 - 1934 | 4 | |
| Kušar, Jerneja | Jerneja Kušar | Actor | 2003 | 1 | |
| Kiss, Ferenc | Ferenc Kiss | Actor | 1931 - 1934 | 8 | |
| Kuntarič, Ana | Ana Kuntarič | Actor | 2003 | 1 | |
| Konstantinov, Iriney | Iriney Konstantinov | Actor | 2003 | 1 | |
| Kavaldjieva, Nevena | Nevena Kavaldjieva | Costume Designer, Designer | 2003 | 2 | |
| Kaplan, Ameenah | Ameenah Kaplan | Actor | 2003 | 1 | |
| Keith, Crystal | Crystal Keith | Actor | 2003 | 1 | |
| Környey, Paula | Paula Környey | Actor | 1931 | 1 | |
| Kandel, Paul | Paul Kandel | Actor | 1989 | 7 | |
| Koukouras, Vasilis | Vasilis Koukouras | Actor | 1989 | 1 | |
| Kecsek, Karina | Karina Kecsek | Actor | 2001 - 2003 | 9 | |
| Kremer, Ulrike | Ulrike Kremer | Costume Designer | 2001 - 2003 | 9 | |
| Kleiven, Tommy | Tommy Kleiven | Actor | 2015 | 6 | |
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