| Klett, Renate | Renate Klett | Director | 1973 | 1 | 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 | |
| Kříž, Karel | Karel Kříž | Director | 1972 - 1983 | 2 | |
| Krampe, Klaus | Klaus Krampe | Director | 1975 - 1998 | 2 | |
| Kutz, Kazimierz | Kazimierz Kutz | Director | 1979 | 1 | |
| Kirst, Klaus-Dieter | Klaus-Dieter Kirst | Director | 1972 - 2010 | 2 | |
| Kreppel, Herbert | Herbert Kreppel | Director | 1966 - 1972 | 2 | |
| Kirchner, Otto | Otto Kirchner | Director | 1929 | 1 | |
| Kubik, Karl-Heinz | Karl-Heinz Kubik | Director | 1972 | 1 | |
| Kupke, Peter | Peter Kupke | Director | 1983 - 1997 | 6 | 1 |
| Keller, Jan | Jan Keller | Director | 1956 | 1 | 1 |
| Knick, Gerhard | Gerhard Knick | Director | 1961 - 1964 | 2 | |
| Kougioumtzis, Mimis | Mimis Kougioumtzis | Director | 1989 | 1 | |
| Khan, Khaled | Khaled Khan | Director | 1993 | 1 | |
| Karadzhov, Ivan | Ivan Karadzhov | Director | 1993 | 1 | |
| Krewer, Harald | Harald Krewer | Director | 1995 | 1 | |
| Kustila, Heikki | Heikki Kustila | Director | 1995 | 1 | |
| Klein, Tanya | Tanya Klein | Director | 1998 - 2002 | 2 | |
| Kesten, Peter | Peter Kesten | Director | 2008 - 2009 | 7 | |
| 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 | |
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