| Kalmet, Leo | Leo Kalmet (Leo Kalmet) | Director | 1943 | 2 | |
| Kavanaugh, Rachel | Rachel Kavanaugh (Rachel Kavanaugh) | Director | 2004 | 7 | 1 |
| Kelling, Edgar | Edgar Kelling (Edgar Kelling) | Director | 1971 | 1 | |
| Kemppi, Raiku | Raiku Kemppi (Raiku Kemppi) | Director | 1980 | 1 | |
| Khalifa, Ali | Ali Khalifa (Ali Khalifa) | Director | 2006 | 1 | 1 |
| Kimming, Stephan | Stephan Kimming (Stephan Kimming) | Director | 2004 | 1 | |
| Kindermann, Uta | Uta Kindermann (Uta Kindermann) | Director | 2005 | 4 | |
| Kingsford-Brown, Jeff | Jeff Kingsford-Brown (Jeff Kingsford-Brown) | Director | 2004 | 1 | |
| Klette, Michael | Michael Klette (Michael Klette) | Director | 1999 - 2015 | 2 | |
| Knaus, Walter | Walter Knaus (Walter Knaus) | Director | 1956 - 1965 | 2 | |
| Koczanowicz, Zbigniew | Zbigniew Koczanowicz (Zbigniew Koczanowicz) | Director | 1960 | 1 | |
| Koerber, Edith | Edith Koerber (Edith Koerber) | Director | 2005 - 2006 | 3 | |
| Kornmüller, Jacqueline | Jacqueline Kornmüller (Jacqueline Kornmüller) | Director | 1999 - 2005 | 3 | |
| Kreidl, Heinz | Heinz Kreidl (Heinz Kreidl) | Director | 1977 - 2003 | 6 | |
| Krempel, Wolfram | Wolfram Krempel (Wolfram Krempel) | Director | 1998 | 1 | |
| Krogh, Morten | Morten Krogh (Morten Krogh) | Director | 2001 - 2006 | 3 | |
| Krüger, Gert | Gert Krüger (Gert Krüger) | Director | 2008 | 1 | |
| Kruse, Jürgen | Jürgen Kruse (Jürgen Kruse) | Director | 1986 - 1993 | 2 | |
| Kirke, Francis T. | Francis T. Kirke (Francis T. Kirke) | Director | 2007 | 8 | |
| Kareman, Pamela Moller | Pamela Moller Kareman (Pamela Moller Kareman) | Director | 2006 | 2 | 1 |
| Kayser, Karl Georg | Karl Georg Kayser (Karl Georg Kayser) | Director | 1997 - 1999 | 2 | 1 |
| Korsan, Noemi | Noemi Korsan (Noemi Korsan) | Director | 1965 | 1 | |
| Kasuya, Toshiyuki | Toshiyuki Kasuya (Toshiyuki Kasuya) | Director | 1948 | 1 | |
| Kato, Nagaharu | Nagaharu Kato (Nagaharu Kato) | Director | 1931 - 1937 | 2 | |
| Kramer, Tim | Tim Kramer (Tim Kramer) | Director | 2002 - 2018 | 2 | |
| Krasnjanskij, E. | E. Krasnjanskij (E. Krasnjanskij) | Director | 1938 | 1 | |
| Klētnieks, Nauris | Nauris Klētnieks (Nauris Klētnieks) | Director | 1974 | 1 | |
| Kimmig, Stephan | Stephan Kimmig (Stephan Kimmig) | Director | 2002 - 2021 | 16 | |
| Klinkenberg, Teuntje | Teuntje Klinkenberg (Teuntje Klinkenberg) | Director | 1986 | 1 | |
| Kilburn, Terence | Terence Kilburn (Terence Kilburn) | Director | 1962 - 1972 | 4 | |
| Koppel, Tina | Tina Koppel (Tina Koppel) | Director | 2003 | 1 | |
| Kraft-Alexander, - | - Kraft-Alexander (- Kraft-Alexander) | Director | 1964 | 1 | |
| Kas'janova, Gennadija | Gennadija Kas'janova (Gennadija Kas'janova) | Director | 2004 | 1 | |
| Klein, Ralph | Ralph Klein (Ralph Klein) | Director | 1973 | 1 | |
| Knight, David | David Knight (David Knight) | Director | 1984 - 1988 | 2 | |
| Końarski, Emilian | Emilian Końarski (Emilian Końarski) | Director | 1879 | 1 | |
| Kurz, August | August Kurz (August Kurz) | Director | 1887 | 1 | |
| Köchy, Max | Max Köchy (Max Köchy) | Director | 1897 | 1 | |
| Knowles, Edwin | Edwin Knowles (Edwin Knowles) | Director | 1898 | 1 | |
| Kilian, Eugen | Eugen Kilian (Eugen Kilian) | Director | 1896 - 1910 | 17 | |
| Krempien, Fritz | Fritz Krempien (Fritz Krempien) | Director | 1909 | 1 | |
| Kronacher, Dr. Alwin | Alwin Kronacher (Dr. Alwin Kronacher) | Director | 1911 - 1925 | 9 | |
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