| Klētnieks, Nauris | Nauris Klētnieks | Director | 1974 | 1 | |
| Kimmig, Stephan, | Stephan Kimmig | Director | 2002 - 2009 | 14 | |
| Klinkenberg, Teuntje | Teuntje Klinkenberg | Director | 1986 | 1 | |
| Kilburn, Terence | Terence Kilburn | Director | 1962 - 1972 | 4 | |
| Koppel, Tina | Tina Koppel | Director | 2003 | 1 | |
| Kraft-Alexander, - | - Kraft-Alexander | Director | 1964 | 1 | |
| Kas'janova, Gennadija | Gennadija Kas'janova | Director | 2004 | 1 | |
| Klein, Ralph | Ralph Klein | Director | 1973 | 1 | |
| Knight, David | David Knight | Director | 1984 - 1988 | 2 | |
| Końarski, Emilian, | Emilian Końarski | Director | 1879 | 1 | |
| Kurz, August, | August Kurz | Director | 1887 | 1 | |
| Köchy, Max, | Max Köchy | Director | 1897 | 1 | |
| Knowles, Edwin, | Edwin Knowles | Director | 1898 | 1 | |
| Kilian, Eugen, | Eugen Kilian | Director | 1896 - 1910 | 17 | |
| Krempien, Fritz, | Fritz Krempien | Director | 1909 | 1 | |
| Kronacher, Dr. Alwin, | Alwin Kronacher (Dr. Alwin Kronacher) | Director | 1911 - 1925 | 9 | |
| Kasten, Otto, | Otto Kasten | Director | 1938 | 1 | |
| Klopsch, Kurt, | Kurt Klopsch | Director | 1945 | 1 | |
| Koefod, Thorvald, | Thorvald Koefod | Director | 1900 | 1 | |
| Kugelberg, F., | F. Kugelberg | Director | 1902 | 1 | |
| Klausen, Kjell, | Kjell Klausen | Director | 2003 | 1 | |
| Klein, Lone, | Lone Klein | Director | 2006 | 1 | |
| Kongshavn, Linn Meyer, | Linn Meyer Kongshavn | Director | 2006 - 2008 | 3 | |
| Klarskov, Paul, | Paul Klarskov | Director | 2009 | 1 | |
| Kayn, Elena, | Elena Kayn | Director | 2010 | 1 | |
| Korsunovas, Oskaras, | Oskaras Korsunovas | Director | 2012 | 1 | |
| Kilde, Gunhild Aarebrot, | Gunhild Aarebrot Kilde | Director | 2013 - 2014 | 2 | |
| Kārkliņš [Zeltmatis], Ernests, | Ernests Kārkliņš [Zeltmatis] | Director | 1917 | 1 | |
| Krinkels, L., | L. Krinkels | Director | 1918 | 1 | |
| Kantor, Alexandr, | Alexandr Kantor | Director | 1923 | 1 | |
| Klein, Heinz Joachim | Heinz Joachim Klein | Director | 1960 - 1975 | 2 | |
| Kaschenz, Kurt | Kurt Kaschenz | Director | 1974 | 1 | |
| Klett, Renate | Renate Klett | Director | 1973 | 1 | |
| Karantinos, Sokratis | Sokratis Karantinos | Director | 1974 | 7 | |
| Kordziński, Roman | Roman Kordziński | Director | 1968 - 1971 | 3 | |
| Krobot, Ivo | Ivo Krobot | Director | 1995 - 1996 | 2 | |
| Kay, Arthur W. | Arthur W. Kay | Director | 1928 - 1967 | 2 | |
| Komisarževskis, Fjodors | Fjodors Komisarževskis | Director | 1929 | 1 | |
| Kostopoulos, Lampros | Lampros Kostopoulos | Director | 1972 - 1989 | 4 | |
| Kaplan, Em. | Em. Kaplan | Director | 1911 | 1 | |
| Knights, Robert | Robert Knights | Director | 1974 | 1 | |
| Kerr, Tom | Tom Kerr | Director | 1975 | 1 | |
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