| Krawczykowski, Zbigniew | Zbigniew Krawczykowski | Translator | 1963 – 2011 | 14 | |
| Kosiorek, Andrew | Andrew Kosiorek | Lighting Designer | 1973 | 1 | |
| Kottas, Hanna | Hanna Kottas | Actor | 1974 | 1 | |
| Kroneberg, Immo | Immo Kroneberg | Actor | 1974 | 2 | |
| Kafkaridis, Stelios | Stelios Kafkaridis | Actor | 1974 | 7 | |
| Karantinos, Sokratis | Sokratis Karantinos | Director | 1974 | 7 | |
| Kuzyszyn, Ryszard | Ryszard Kuzyszyn | Designer | 1971 | 1 | |
| Kłopocki, Włodzimierz | Włodzimierz Kłopocki | Actor | 1971 | 1 | |
| Kwaśniewska, Sława | Sława Kwaśniewska | Actor | 1971 | 1 | |
| Kordziński, Roman | Roman Kordziński | Director | 1968 – 1971 | 3 | |
| Kolstad, Kirsti | Kirsti Kolstad | Actor | 1971 | 45 | |
| Koppendorfer, Franz | Franz Koppendorfer | Costume Designer, Designer | 1973 | 2 | |
| Kuck, Gerd Leo | Gerd Leo Kuck | Director, Dramaturg | 1972 | 4 | |
| Klouman, Borghild | Borghild Klouman | Actor | 1928 | 9 | |
| Kibart, David | David Kibart | Designer | 1974 – 1980 | 2 | |
| Kasten, Thomas | Thomas Kasten | Actor | 1973 – 2014 | 6 | |
| Kilian, Rosemarie | Rosemarie Kilian | Actor | 1966 | 2 | |
| Karge, Manfred | Manfred Karge | Actor, Adaptation, Director | 1973 – 1992 | 5 | |
| Köttel, Heinz | Heinz Köttel | Costume Designer, Designer | 1964 | 4 | |
| Kosugi, Yoshio | Yoshio Kosugi | Actor | 1925 – 1928 | 2 | |
| Kaupiņa, Mirdza | Mirdza Kaupiņa | Actor | 1928 | 1 | |
| Kump, Mary Helen | Mary Helen Kump | Actor | 1928 | 1 | |
| Knoblauch, William | William Knoblauch | Actor | 1928 | 6 | |
| Kancellary, Roger | Roger Kancellary | Actor | 1928 | 1 | |
| Kristoffersen, Knute | Knute Kristoffersen | Actor | 1928 | 1 | |
| Kihle, Aase | Aase Kihle | Actor | 1928 | 14 | |
| Kimmestad, Elna | Elna Kimmestad | Actor | 1947 – 1980 | 12 | |
| Kavenaugh, Dorrie | Dorrie Kavenaugh | Actor | 1977 | 1 | |
| Konuschlieva, Rajna | Rajna Konuschlieva | Translator | 1977 | 3 | |
| Kiss, Irén | Irén Kiss | Actor | 1928 | 3 | |
| Kent, Sherryn | Sherryn Kent | Actor | 1973 | 1 | |
| Kjelsberg, Sverre | Sverre Kjelsberg | Actor, Composer | 1975 – 1976 | 18 | |
| Knauthe, Günther | Günther Knauthe | Actor | 1973 | 1 | |
| Kaiser, - | - Kaiser | Actor | 1928 | 1 | |
| Kotzé, J. | J. Kotzé | Actor | 1928 | 1 | |
| Kreysern, Eberhard | Eberhard Kreysern | Actor | 1920 | 2 | |
| Krogh, Arne | Arne Krogh | Actor | 1928 | 3 | |
| Kingsley, Susan, Cardwell | Susan Cardwell Kingsley | Actor | 1972 | 1 | |
| Klein, Barbara | Barbara Klein | Actor | 1975 | 2 | |
| Klingenberg, Axel | Axel Klingenberg | Actor | 1975 | 1 | |
| Kiskiinen, Tero | Tero Kiskiinen | Designer | 1978 | 1 | |
| Kämpfer, Julika | Julika Kämpfer | Actor | 1973 | 1 | |
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