| Kubes, Petr | Petr Kubes | Actor | 2012 | 1 | 2 |
| Klepáčková, Klára | Klára Klepáčková | Actor | 2012 | 1 | 2 |
| Kubátová, Jana | Jana Kubátová | Actor | 2005 - 2006 | 2 | 2 |
| Krivošeev, Vadim | Vadim Krivošeev | Actor | 2007 | 1 | 2 |
| Kampwirth, Jan-Peter | Jan-Peter Kampwirth | Actor | 2006 - 2015 | 6 | 2 |
| Kukulies, Ronald | Ronald Kukulies | Actor | 2006 - 2012 | 4 | 2 |
| Krisch, Johannes | Johannes Krisch | Actor | 1994 - 2012 | 5 | 2 |
| Kosel, David | David Kosel | Actor | 2009 - 2010 | 5 | 2 |
| Koch, Jens | Jens Koch | Actor | 2010 - 2011 | 12 | 2 |
| Koch, Moritz Nikolaus | Moritz Nikolaus Koch | Actor | 2010 - 2011 | 12 | 2 |
| Kittmann, Jan | Jan Kittmann | Actor | 2010 - 2011 | 12 | 2 |
| Kniploks, Ingus | Ingus Kniploks | Actor | 2010 | 1 | 2 |
| Keane, Aidan | Aidan Keane | Actor | 2012 | 1 | 2 |
| Krzysch, Caspar | Caspar Krzysch | Actor | 2012 | 1 | 2 |
| Kanaga, Chris | Chris Kanaga | Actor | 2012 | 1 | 2 |
| Karimi, Niki | Niki Karimi | Actor | 1993 | 1 | 1 |
| King, Dennis | Dennis King | Actor | 1937 - 1938 | 7 | 1 |
| Kúnos, László | László Kúnos | Translator | 1991 - 2019 | 55 | 1 |
| Kjærulff-Schmidt, Palle | Palle Kjærulff-Schmidt | Director | 1974 - 2000 | 2 | 1 |
| Kowalski, Władysław | Władysław Kowalski | Actor | 1972 - 2006 | 9 | 1 |
| Kromminga, Katharina | Katharina Kromminga | Costume Designer | 2002 - 2017 | 8 | 1 |
| Klöpfer, Eugen | Eugen Klöpfer | Actor | 1914 - 1937 | 11 | 1 |
| Kapeljus, Emil Borosovich | Emil Borosovich Kapeljus | Costume Designer, Designer | 2003 - 2008 | 5 | 1 |
| Kucharesin, Valerij | Valerij Kucharesin | Actor | 2003 - 2006 | 2 | 1 |
| Kovanko, Lilga | Lilga Kovanko | Actor | 1977 - 1978 | 2 | 1 |
| Kirshenbaum, Debra | Debra Kirshenbaum | Actor | 2006 | 1 | 1 |
| Koschitz, Julia | Julia Koschitz | Actor | 2006 | 3 | 1 |
| Kahn, Michael | Michael Kahn | Director | 1979 - 2001 | 4 | 1 |
| Kaitue, Katariina | Katariina Kaitue | Actor | 2002 - 2007 | 2 | 1 |
| Kallio, Ismo | Ismo Kallio | Actor | 1966 - 2002 | 4 | 1 |
| Kallio, Jaakko | Jaakko Kallio | Actor | 1995 | 1 | 1 |
| Kaplanová, Valerie | Valerie Kaplanová | Actor | 1956 - 1967 | 3 | 1 |
| Karasek, Daniel | Daniel Karasek | Adaptation, Director, Producer, Translator | 1990 - 2019 | 63 | 1 |
| Karoliussen, Håkon | Håkon Karoliussen | Actor | 1998 - 2006 | 2 | 1 |
| Kavanaugh, Rachel | Rachel Kavanaugh | Director | 2004 | 7 | 1 |
| Keller, Markus | Markus Keller | Designer, Director | 2005 - 2015 | 3 | 1 |
| Keppler, Heinrich | Heinrich Keppler | Actor, Director | 1880 - 1893 | 16 | 1 |
| Kerwin, Shawn | Shawn Kerwin | Costume Designer | 2000 | 1 | 1 |
| Kessler, Anne | Anne Kessler | Actor, Designer, Director | 1993 - 2006 | 3 | 1 |
| Keyes, Lucy | Lucy Keyes | Costume Designer, Director | 1992 - 1994 | 3 | 1 |
| Khalifa, Ali | Ali Khalifa | Director | 2006 | 1 | 1 |
| Khell, Csörsz | Csörsz Khell | Designer | 2001 - 2017 | 19 | 1 |
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