| Koronowski, Grete | Grete Koronowski | Actor | 1909 | 1 | |
| Korposoff, Lars | Lars Korposoff | Actor | 1964 - 1991 | 24 | |
| Korwinowa, Paulina | Paulina Korwinowa | Actor | 1887 | 1 | |
| Kosmowska, Ada | Ada Kosmowska | Actor | 1902 - 1921 | 4 | |
| Kołogórska, Ewa | Ewa Kołogórska | Actor | 1958 | 1 | |
| Kosolosky, Ludovic | Ludovic Kosolosky | Actor | 2007 | 1 | |
| Kostolevskij, Igor | Igor Kostolevskij | Actor | 1999 - 2013 | 2 | |
| Kostorž, Jurij | Jurij Kostorž | Actor | 1986 - 1990 | 2 | |
| Kőszegi, Gyula | Gyula Kőszegi | Actor | 1962 | 1 | |
| Koszutska, Olga | Olga Koszutska | Adaptation, Director | 1954 - 1978 | 8 | |
| Kotarbiński, Józef | Józef Kotarbiński | Actor, Director | 1882 - 1908 | 9 | |
| Koukoulommatis, Michalis | Michalis Koukoulommatis | Actor | 1993 - 2007 | 5 | |
| Koulouri, Eleonora | Eleonora Koulouri | Actor | 2002 | 1 | |
| Kovacs, Mijou | Mijou Kovacs | Actor | 2002 - 2004 | 12 | |
| Kovács, Mária | Mária Kovács | Actor | 1960 - 1978 | 2 | |
| Kovaříková, Sasa | Sasa Kovaříková | Actor | 1961 | 1 | |
| Kozak, Bogusław | Bogusław Kozak | Actor | 1957 | 1 | |
| Kozma, Salla | Salla Kozma | Actor | 2006 | 1 | |
| Koźmin, Maria | Maria Koźmin | Actor | 1889 | 1 | |
| Kozłowski, Maciej | Maciej Kozłowski | Actor | 2006 - 2009 | 7 | |
| Kraan, Mark | Mark Kraan | Actor | 2004 | 1 | |
| Kracke, Herbert | Herbert Kracke | Actor | 1945 | 1 | |
| Kradolfer, Benjamin | Benjamin Kradolfer | Actor | 1993 - 1999 | 2 | |
| Krahl, Hilde | Hilde Krahl | Actor | 1943 | 1 | |
| Krakowski, Wojciech | Wojciech Krakowski | Designer | 1957 - 1975 | 6 | |
| Krämer, Oliver | Oliver Krämer | Actor, Composer | 1987 - 1991 | 4 | |
| Krappé, Ann | Ann Krappé | Actor | 1963 | 1 | |
| Kraska, Brigitte | Brigitte Kraska | Mask Maker | 1990 - 1992 | 2 | |
| Kraska, Manfred | Manfred Kraska | Designer | 1986 | 1 | |
| Krass, Michael | Michael Krass | Costume Designer | 1993 - 2017 | 6 | |
| Krassa, Susanne | Susanne Krassa | Actor | 2004 | 1 | |
| Kratochwil, Jeanny | Jeanny Kratochwil | Designer | 2000 - 2003 | 3 | |
| Kraubs, Karl | Karl Kraubs | Mask Maker | 1969 | 1 | |
| Krauel, Gerold | Gerold Krauel | Actor | 1975 | 1 | |
| Kraus, Josef | Josef Kraus | Actor | 1965 | 1 | |
| Krause, Jan | Jan Krause | Actor | 1977 | 1 | |
| Krause, Marleen | Marleen Krause | Actor | 1977 | 1 | |
| Krautwig, Eva | Eva Krautwig | Actor | 2002 - 2007 | 2 | |
| Kreibich, Margit | Margit Kreibich | Costume Designer | 1954 | 1 | |
| Kreidel, Henry | Henry Kreidel | Actor | 1909 | 1 | |
| Kreidel, Martha | Martha Kreidel | Actor | 1909 | 1 | |
| Kremer, Ulli | Ulli Kremer | Costume Designer | 2000 - 2003 | 3 | |
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