| Kurtz, Howard Vincent | Howard Vincent Kurtz | Costume Designer | 1995 - 2006 | 4 | |
| Kalliga, Thaleia | Thaleia Kalliga | Actor | 1935 - 1995 | 4 | |
| Kučera, Jan | Jan Kučera | Actor | 1969 - 2000 | 4 | |
| Kreischer, Jutta | Jutta Kreischer | Costume Designer | 2003 - 2017 | 4 | |
| Kelemen, Pál | Pál Kelemen | Actor | 1917 - 1918 | 4 | |
| Kasch, Günter | Günter Kasch | Actor | 1965 - 1967 | 4 | |
| Kopelousis, Giorgos | Giorgos Kopelousis | Actor | 1967 | 4 | |
| Knopp, Felix | Felix Knopp | Actor | 2004 - 2006 | 4 | 1 |
| Knudsen, Kolbjörn | Kolbjörn Knudsen | Actor | 1943 - 1965 | 4 | |
| Kjærulff-Schmidt, Helge | Helge Kjærulff-Schmidt | Actor | 1956 - 2003 | 4 | 1 |
| Kaszab, Anna | Anna Kaszab | Actor | 1925 - 1932 | 4 | |
| Kindred, Graham | Graham Kindred | Lighting Designer | 2001 - 2002 | 4 | |
| Kriegenburg, Andreas | Andreas Kriegenburg | Director | 1997 - 2002 | 4 | 1 |
| Kiupel, Beate | Beate Kiupel | Actor | 1986 - 2002 | 4 | |
| Keller, Tibert | Tibert Keller | Actor | 2002 | 4 | |
| Kotsarinis, Giannis | Giannis Kotsarinis | Actor | 2002 | 4 | |
| Koltay, Gyula | Gyula Koltay | Actor | 1929 - 1934 | 4 | |
| Kolbe, Thomas | Thomas Kolbe | Actor | 2003 - 2005 | 4 | |
| Krietsch-Matzura, Oliver | Oliver Krietsch-Matzura | Actor | 1997 | 4 | |
| Kefalas, Nikos | Nikos Kefalas | Actor | 1993 - 2001 | 4 | |
| Körmendi, János | János Körmendi | Actor | 1971 - 1975 | 4 | |
| Kempers, Cornelia | Cornelia Kempers | Actor | 2003 | 4 | 1 |
| Kubicki, Przemyslaw | Przemyslaw Kubicki | Actor | 2003 | 4 | |
| Küng, Rainer | Rainer Küng | Lighting Designer | 2003 - 2012 | 4 | |
| Krejsová, Klára | Klára Krejsová | Actor | 2010 | 4 | |
| Kostrova, Elena | Elena Kostrova | Actor | 2003 - 2005 | 4 | |
| Kajdanski, Tomasz | Tomasz Kajdanski | Adaptation, Choreographer | 2004 | 4 | |
| Klüpfel, Ariane | Ariane Klüpfel | Actor | 2001 | 4 | |
| Klem, Jiří | Jiří Klem | Actor | 1999 - 2008 | 4 | 1 |
| Komninou, Filareti | Filareti Komninou | Actor | 2004 - 2008 | 4 | |
| Kimoulis, Giorgos | Giorgos Kimoulis | Actor, Translator | 1999 - 2013 | 4 | |
| Kalske, Jenna | Jenna Kalske | Actor | 2005 | 4 | |
| Knieling, Konrad Oktavian | Konrad Oktavian Knieling | Dramaturg | 2005 - 2007 | 4 | |
| Kaizuka, Hideto | Hideto Kaizuka | Actor | 2001 - 2008 | 4 | |
| Khoury, Jameel | Jameel Khoury | Actor | 2006 | 4 | |
| Khoury, Makram J. | Makram J. Khoury | Actor | 2006 | 4 | |
| Kristensen, Thea, Holmberg | Thea Holmberg Kristensen | Mask Maker | 2015 - 2017 | 4 | |
| Köhler, Tilmann | Tilmann Köhler | Choreographer, Director | 2006 - 2017 | 4 | 1 |
| Krohn, Marcel | Marcel Krohn | Actor | 2006 | 4 | |
| Kuiper, Pieter | Pieter Kuiper | Actor | 2006 | 4 | |
| Kromer, Konstanze | Konstanze Kromer | Actor | 2006 | 4 | |
| Kokotović, Nada | Nada Kokotović | Designer, Director | 2006 - 2007 | 4 | 1 |
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