| Korun, Mile | Mile Korun | Director | 1993 - 1994 | 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 | |
| Krodera, Olgerta | Oļģerts Kroders | Director | 1960 - 2005 | 6 | |
| 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 - 2009 | 2 | |
| Kato, Shinkichi | Shinkichi Kato | Director | 1967 | 1 | |
| Kiss, Csaba | Csaba Kiss | Director | 2008 - 2009 | 1 | |
| Keresztes, Attila | Attila Keresztes | Director | 2004 - 2019 | 11 | |
| Kern, Dan | Dan Kern | Director | 1997 | 1 | |
| Kulczyk, Todd | Todd Kulczyk | Director | 2002 | 1 | |
| Kriegenburg, Andreas | Andreas Kriegenburg | Director | 1997 - 1998 | 4 | |
| Kramer, Rob | Rob Kramer | Director | 2002 | 1 | |
| Krieger, Portia | Portia Krieger | Director | 2002 | 1 | |
| Koležnik, Mateja | Mateja Koležnik | Director | 2002 | 8 | |
| Kühnel, Tom | Tom Kühnel | Director | 1997 - 2015 | 3 | |
| Kelly, Tony | Tony Kelly | Director | 2003 | 1 | |
| Karlsen, Vibeke | Vibeke Karlsen | Director | 2015 | 1 | |
| Küster, Tina | Tina Küster | Director | 2003 | 1 | |
| Kania, Grazyna | Grazyna Kania | Director | 2003 - 2007 | 3 | |
| Keitel, Richard | Richard Keitel | Director | 2003 | 1 | |
| Kubelka, Alexander | Alexander Kubelka | Director | 2004 - 2011 | 2 | |
| Karbauskis, Mindaugas | Mindaugas Karbauskis | Director | 2001 - 2006 | 2 | |
| Kyriakidis, Christos | Christos Kyriakidis | Director | 2004 - 2005 | 1 | |
| Kempson, Sibyl | Sibyl Kempson | Director | 2015 | 1 | |
| Knödler, Carsten | Carsten Knödler | Director | 2005 - 2016 | 5 | |
| Kariyawasam, Piyal | Piyal Kariyawasam | Director | 2005 | 2 | |
| Keruchenko, Irina | Irina Keruchenko | Director | 2005 | 1 | |
| Konstantin, Karel | Karel Konstantin | Director | 1941 | 1 | |
| Kuhlmann, Saskia | Saskia Kuhlmann | Director | 2005 - 2006 | 2 | |
| Kollár, Viktor | Viktor Kollár | Director | 2011 - 2012 | 2 | |
| Krzemiński , Władysław | Władysław Krzemiński | Director | 1957 | 1 | |
| Karni Cohen, Adam | Adam Karni Cohen | Director | 2001 | 1 | |
| Kristjánsdóttir, María | María Kristjánsdóttir | Director | 2001 - 2002 | 1 | |
| Kiss, Attila, Seprődi | Attila Seprődi Kiss | Director | 1972 | 1 | |
| Knuth, Nicole | Nicole Knuth | Director | 2007 | 1 | |
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