| Kazimierz, Kamiński | Kamiński Kazimierz | Actor | 1904 | 1 | |
| Kalff, Marie | Marie Kalff | Actor | 1904 - 1928 | 2 | |
| Kelbey, Gerald A. | Gerald A. Kelbey | Actor | 1904 | 1 | |
| Korczak-Wesołowski, Zygmunt | Zygmunt Korczak-Wesołowski | Actor | 1904 - 1905 | 2 | |
| Karasińska, Janina (?) | Janina (?) Karasińska | Actor | 1904 | 1 | |
| Kendall, Frk. | Frk. Kendall | Actor | 1904 | 1 | |
| Kirtschev, Atanas | Atanas Kirtschev | Actor | 1904 - 1909 | 8 | |
| Krajewska, Leonia | Leonia Krajewska | Actor | 1904 | 1 | |
| Krastev, Dr. Krastjo | Krastjo Krastev (Dr. Krastjo Krastev) | Actor, Translator | 1905 - 1996 | 9 | |
| Kirkov, Geno | Geno Kirkov | Actor | 1905 | 1 | |
| Kolthoff, Signe | Signe Kolthoff | Actor | 1905 | 2 | |
| Knox, R. F. | R. F. Knox | Actor | 1905 | 1 | |
| Krössing, Adolf | Adolf Krössing | Actor, Director | 1905 | 2 | |
| Kliment, Václav | Václav Kliment | Actor | 1905 | 1 | |
| Kubátová, Marie | Marie Kubátová | Actor | 1905 | 1 | |
| Kindl, Karel | Karel Kindl | Actor | 1905 | 1 | |
| Keith, Carrie | Carrie Keith | Actor | 1905 | 1 | |
| Kettle, Jessie | Jessie Kettle | Actor | 1905 | 1 | |
| Kettle, Hilda | Hilda Kettle | Actor | 1905 | 1 | |
| Klein, Willy | Willy Klein | Actor, Director | 1906 - 1923 | 3 | |
| Korecki, Henryk Cudnowski | Henryk Cudnowski Korecki | Actor | 1906 | 1 | |
| Kotopoulis, Dimitrios | Dimitrios Kotopoulis | Actor | 1906 | 1 | |
| Kotopouli, Marika | Marika Kotopouli | Actor | 1906 - 1945 | 5 | |
| Kotopouli-Loui, Foteini | Foteini Kotopouli-Loui | Actor | 1906 - 1907 | 2 | |
| Kotopouli-Myrat, Chrysoula | Chrysoula Kotopouli-Myrat | Actor | 1906 - 1921 | 3 | |
| Kouris, Nikolaos | Nikolaos Kouris | Actor | 1906 | 2 | |
| Kirchner, Franz | Franz Kirchner | Actor | 1906 - 1907 | 5 | |
| Kempner, Gabriel | Gabriel Kempner | Translator | 1906 - 1918 | 2 | |
| Klaer, Adele | Adele Klaer | Actor | 1906 - 1907 | 3 | |
| Korčagina, E. P. | E. P. Korčagina | Actor | 1903 - 1906 | 2 | |
| Karpáti, Sándor | Sándor Karpáti | Actor | 1906 - 1908 | 5 | |
| Kručiņins, - | - Kručiņins | Actor | 1907 | 1 | |
| Koškins, Kristaps | Kristaps Koškins | Actor, Director | 1907 - 1918 | 10 | |
| Klintscharov, Ivan G. | Ivan G. Klintscharov | Translator | 1907 | 1 | |
| Köllner, Paul | Paul Köllner | Actor | 1907 | 1 | |
| Koht, Thorvald | Thorvald Koht | Actor, Director | 1907 - 1938 | 25 | |
| Kourtelis, (?) | (?) Kourtelis | Actor | 1907 | 3 | |
| Kruckenberg, Ivan | Ivan Kruckenberg | Actor | 1907 - 1908 | 2 | |
| Kaucká, Juliana | Juliana Kaucká | Actor | 1908 | 1 | |
| Kal´manson, M. | M. Kal´manson | Designer | 1908 | 1 | |
| Kachalov, Vasily | Vasily Kachalov | Actor | 1908 | 1 | |
| Kaupiņa, Anna | Anna Kaupiņa | Actor | 1908 - 1909 | 2 | |
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