| Kooij, Paul, R. | Paul R. Kooij | Actor | 1991 - 1992 | 14 | |
| Korper, Debbie | Debbie Korper | Actor | 1991 - 2012 | 117 | |
| Korf, Geoff | Geoff Korf | Lighting Designer | 1993 - 2008 | 4 | |
| Kypourgos, Nikos | Nikos Kypourgos | Composer | 1991 - 1994 | 2 | |
| Kyrtzaki, Maria | Maria Kyrtzaki | Translator | 1991 | 1 | |
| Karaïndrou, Eleni | Eleni Karaïndrou | Composer | 1991 - 2004 | 2 | |
| Kerékgyártó, Olga | Olga Kerékgyártó | Actor | 1930 | 1 | |
| Kolb, Jürgen | Jürgen Kolb | Lighting Designer | 2012 | 1 | |
| Kürstner, Thomas | Thomas Kürstner | Composer, Musical Director | 2002 - 2012 | 2 | |
| Kovács, András, Éry | András Éry Kovács | Adaptation, Designer, Director | 2006 | 3 | |
| Kováts, Ilonka | Ilonka Kováts | Actor | 1906 | 1 | |
| Kárpáthy, Sándor | Sándor Kárpáthy | Actor | 1908 | 1 | |
| Koehler, Scott | Scott Koehler | Actor, Musician | 2012 - 2018 | 80 | |
| Kothari, Pratik | Pratik Kothari | Actor | 2014 | 1 | |
| Kanetkar, Darshan | Darshan Kanetkar | Actor | 2014 | 1 | |
| Kashyap, Vijay | Vijay Kashyap | Actor, Designer | 2010 - 2024 | 18 | |
| Kleinke, Dirk | Dirk Kleinke | Actor | 2014 | 2 | |
| Kennedy, Ashley York | Ashley York Kennedy | Lighting Designer | 1994 - 1995 | 2 | |
| Kaye, Colin | Colin Kaye | Actor | 1994 | 1 | |
| Koschwitz, Andrea | Andrea Koschwitz | Adaptation, Dramaturg | 1994 - 2010 | 12 | |
| Kubus, Renate | Renate Kubus | Actor | 1982 | 1 | |
| Knabl, Nikolaus | Nikolaus Knabl | Sound Designer | 2014 - 2016 | 3 | |
| Kohn, Karl Christian | Karl Christian Kohn | Actor | 1982 | 1 | |
| Krüger, Detlof | Detlof Krüger | Actor | 1982 | 1 | |
| Kaiser, Karin | Karin Kaiser | Actor | 1967 - 1982 | 2 | |
| Kuorikoski, Tuulikki | Tuulikki Kuorikoski | Actor | 1982 | 1 | |
| Kokkonen-Valve, Pirkko | Pirkko Kokkonen-Valve | Actor | 1982 | 1 | |
| Kani, John | John Kani | Actor | 1994 | 1 | |
| Kilburger, Hans Joachim | Hans Joachim Kilburger | Actor | 1976 - 1982 | 3 | |
| Kühnen, Maria | Maria Kühnen | Actor | 1971 - 1982 | 3 | |
| Karallus, Thomas | Thomas Karallus | Actor | 1982 | 1 | |
| Klusen, Ernst A. | Ernst A. Klusen | Director | 1982 | 1 | |
| Kenny, Sian | Sian Kenny | Actor | 1982 - 1983 | 4 | |
| Katsiadaki, Maria | Maria Katsiadaki | Actor | 1994 | 1 | |
| Karazisis, Akylas | Akylas Karazisis | Actor | 1994 - 2015 | 3 | |
| Kapodistria, Natalia | Natalia Kapodistria | Actor | 1994 | 1 | |
| Koumentakis, Giorgos | Giorgos Koumentakis | Composer | 1994 | 1 | |
| Kosse, Grit | Grit Kosse | Mask Maker | 1994 | 1 | |
| Kleinert, Franziska | Franziska Kleinert | Actor | 1994 | 1 | |
| Keskinen, Usko | Usko Keskinen | Actor | 1994 | 1 | |
| Kouki, Tapio | Tapio Kouki | Actor | 1967 - 1994 | 3 | |
| Kanto, Maija | Maija Kanto | Mask Maker | 1994 | 1 | |
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