| Kapelonis, Kostis | Kostis Kapelonis | Director | 2002 - 2010 | 7 | 1 |
| Koller, Karin | Karin Koller | Director | 2010 | 1 | |
| Khutsishvili, Vano | Vano Khutsishvili | Director | 2011 | 1 | |
| Klemm, Wojtek | Wojtek Klemm | Director | 2012 | 1 | |
| Karpianus, Tereza | Tereza Karpianus | Director | 2012 | 1 | |
| King, Lillian | Lillian King | Director | 2013 | 1 | |
| Kinzer, Craig D., D. | Craig D. Kinzer | Director | 1985 | 1 | 1 |
| Kristensen, Jeppe | Jeppe Kristensen | Director | 2014 - 2016 | 7 | 1 |
| Križaj, Franci | Franci Križaj | Director | 1970 - 1986 | 2 | |
| Kusenberg, Klaus | Klaus Kusenberg | Director | 1987 - 2011 | 5 | |
| King, Peter | Peter King | Director | 2013 | 1 | 1 |
| Kołodziejczyk, Jerzy | Jerzy Kołodziejczyk | Director | 1990 | 1 | |
| Kiesewetter, Ekkehard | Ekkehard Kiesewetter | Director | 1990 | 1 | |
| Krogh, Line | Line Krogh | Director | 1977 - 1988 | 3 | |
| Kautek, Rudolf | Rudolf Kautek | Director | 1966 - 1988 | 2 | |
| Kautz, Jürgen | Jürgen Kautz | Director | 1990 | 1 | |
| Kent, David G. | David G. Kent | Director | 1991 | 1 | |
| Kurš, Antonín | Antonín Kurš | Director | 1939 - 1956 | 2 | |
| Kealey, Patrick | Patrick Kealey | Director | 1992 | 1 | |
| Klar, Wolfgang | Wolfgang Klar | Director | 1992 | 1 | |
| Knott, Dewayne | Dewayne Knott | Director | 1988 | 1 | |
| Kunze, Dietrich | Dietrich Kunze | Director | 1992 | 1 | |
| Kos, Albert | Albert Kos | Director | 1982 | 1 | |
| Knapp, Ralf | Ralf Knapp | Director | 1991 | 1 | |
| Kern, Gregor | Gregor Kern | Director | 1993 | 1 | |
| Kublinskis, Mihails | Mihails Kublinskis | Director | 1991 | 1 | |
| Kornitzer, Laszlo | Laszlo Kornitzer | Director | 1993 | 1 | |
| Kaasik-Aaslav, Katri | Katri Kaasik-Aaslav | Director | 1993 | 1 | |
| Korun, Mile | Mile Korun | Director | 1993 | 1 | |
| Klusen, Ernst A. | Ernst A. Klusen | Director | 1982 | 1 | |
| Koloc, Rudolf | Rudolf Koloc | Director | 1994 | 1 | |
| Kobelev, Nikita | Nikita Kobelev (Никита Кобелев) | Director | 2013 | 1 | |
| Korhonen, Kaisa | Kaisa Korhonen | Director | 1980 | 1 | 1 |
| Krodera, Olgerta | Oļģerts Kroders | Director | 1960 - 2005 | 6 | 1 |
| Kern, Jürgen | Jürgen Kern | Director | 1996 | 1 | |
| Kwieciński, Michał | Michał Kwieciński | Director | 1997 | 1 | |
| Kakleas, Giannis | Giannis Kakleas | Director | 1995 | 1 | |
| Konter, László | László Konter | Director | 1995 | 1 | |
| Kingsford, Jess | Jess Kingsford | Director | 2005 | 1 | |
| Kapur, Anuradha | Anuradha Kapur | Director | 2008 | 2 | 1 |
| Kato, Shinkichi | Shinkichi Kato | Director | 1967 | 1 | |
| Kiss, Csaba | Csaba Kiss | Director | 2008 | 1 | 1 |
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