| Köster, Gundula | Gundula Köster | Actor | 1993 | 1 | |
| Koster, Franz | Franz Koster | Actor | 1894 - 1908 | 4 | |
| Köstem, Şebnem | Şebnem Köstem (Sebnem Kostem) | Actor | 2012 | 1 | |
| Kostecki, Wojciech | Wojciech Kostecki | Actor | 1973 | 1 | |
| Kostecka, Oliver | Oliver Kostecka | Designer | 2004 | 2 | 1 |
| Kostantaras, Lampros | Lampros Kostantaras | Actor | 1952 | 1 | |
| Kostakis, Iraklis | Iraklis Kostakis | Actor | 2005 | 2 | |
| Kostadinova, Hristina | Hristina Kostadinova | Actor | 1979 | 1 | |
| Kostadinov, Kalin | Kalin Kostadinov | Actor | 2015 - 2016 | 2 | |
| Kostadinov, Georgi | Georgi Kostadinov | Actor | 1997 | 1 | |
| Koßwig, Curt | Curt Koßwig | Actor | 1914 | 2 | |
| Kossowsky, Jorge | Jorge Kossowsky | Assistant Director, Director | 1952 - 1956 | 3 | |
| Kossovsky, Sylvia | Sylvia Kossovsky | Actor | 1934 | 1 | |
| Kossi, Enrique | Enrique Kossi | Actor | 1972 | 1 | |
| Kossegg, Therese | Therese Kossegg | Actor | 1907 - 1928 | 4 | |
| Kosse, Grit | Grit Kosse | Mask Maker | 1994 | 1 | |
| Kosowski, Zbigniew | Zbigniew Kosowski | Actor | 2015 - 2016 | 10 | |
| Kosová, Eliška | Eliška Kosová | Designer | 2006 | 1 | |
| Kosolosky, Ludovic | Ludovic Kosolosky | Actor | 2007 | 1 | |
| Kosofsky, Martin, I. | Martin I. Kosofsky | Actor | 1949 | 1 | |
| Kosock, David | David Kosock | Actor | 1999 | 1 | |
| Koso, Ištvan | Ištvan Koso | Designer | 1989 | 1 | |
| Kośnierska, Janina | Janina Kośnierska | Actor | 1906 | 1 | |
| Košnerová, Antonie | Antonie Košnerová | Actor | 1912 - 1926 | 3 | |
| Kosmowska, Ada | Ada Kosmowska | Actor | 1902 - 1921 | 4 | |
| Kosmo, Ingebjørg | Ingebjørg Kosmo | Actor | 2001 - 2014 | 9 | 1 |
| Kosmo, Wanda | Wanda Kosmo | Actor, Director | 1958 - 1963 | 4 | |
| Kosminski, Burkhard, C. | Burkhard C. Kosminski | Director | 2008 - 2022 | 2 | |
| Kosmalski, Svenja | Svenja Kosmalski | Costume Designer | 2024 | 1 | |
| Kosmalla, Jessica | Jessica Kosmalla | Actor | 1984 | 1 | |
| Koslow, Esther | Esther Koslow | Actor | 1969 | 1 | |
| Koškins, Kristaps | Kristaps Koškins | Actor, Director | 1907 - 1918 | 10 | |
| Koskinen, Juhani | Juhani Koskinen | Translator | 1980 | 1 | |
| Koškina, Evgenija | Evgenija Koškina | Dancer | 2016 - 2019 | 5 | |
| Koskelainen, Yrjö | Yrjö Koskelainen | Translator | 1939 | 1 | 1 |
| Koska, Ute | Ute Koska | Actor | 1960 | 1 | |
| Kosjek, Anita | Anita Kosjek | Actor | 1952 | 1 | |
| Kositsyn, Boris | Boris Kositsyn | Actor | 2005 | 1 | |
| Kosiorek, Wacsaw | Wacsaw Kosiorek | Designer | 1955 | 1 | |
| Kosiorek, Andrew | Andrew Kosiorek | Lighting Designer | 1973 | 1 | |
| Kosiński, Włodzimierz | Włodzimierz Kosiński | Actor, Director | 1891 - 1922 | 12 | |
| Kosinski, Jan | Jan Kosinski | Designer | 1957 | 1 | |
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