| Klenk-Wulff, Sophie | Sophie Klenk-Wulff | Costume Designer | 2024 | 2 | |
| Klas, Eri | Eri Klas | Conductor | 1992 | 1 | 1 |
| Katajavuori, Esa | Esa Katajavuori | Conductor | 1994 | 1 | |
| Kohnke, Erich | Erich Kohnke | Conductor | 1932 | 1 | |
| Kießig, Georg | Georg Kießig | Conductor | 1939 | 1 | |
| Krannhals, Alexander | Alexander Krannhals | Conductor | 1940 | 1 | |
| Konwitschny, Franz | Franz Konwitschny | Conductor | 1940 | 1 | |
| Knudsen, Lennart, Nordløf | Lennart Nordløf Knudsen | Conductor | 1945 - 1946 | 2 | |
| Kragstad, Petter | Petter Kragstad | Conductor | 2013 - 2014 | 2 | |
| Kırhan, Yıldırım | Yıldırım Kırhan | Conductor | 1971 | 1 | |
| Kajanus, Robert | Robert Kajanus | Conductor | 1916 | 1 | |
| Kleiber, Erich | Erich Kleiber | Conductor | 1917 | 1 | |
| Kraus, Richard | Richard Kraus | Conductor | 1927 | 1 | |
| Karavaev, Yuri | Yuri Karavaev | Conductor | 2020 | 1 | |
| Knauf, Johanna | Johanna Knauf | Conductor | 2009 | 1 | |
| Kuhn, Hans Peter | Hans Peter Kuhn | Composer, Sound Designer | 1991 - 1993 | 7 | |
| Kalodiki, Georgia | Georgia Kalodiki | Composer, Sound Designer | 2012 | 2 | |
| Kluger, Daniel | Daniel Kluger | Composer, Sound Designer | 2016 - 2021 | 4 | |
| Kettley, Steve | Steve Kettley | Composer, Musician | 2004 | 10 | |
| Kürstner, Thomas | Thomas Kürstner | Composer, Musical Director | 2002 - 2012 | 2 | |
| Karahisaridis, Giannis | Giannis Karahisaridis | Composer, Director, Lighting Designer | 2008 | 3 | |
| Kaiser, Martin | Martin Kaiser | Composer, Conductor | 1896 | 2 | |
| Koppel, Herman, D. | Herman D. Koppel | Composer, Conductor | 1964 | 2 | |
| Kalinowska, Halina | Halina Kalinowska | Composer | 1989 | 1 | |
| Kardaś, Grzegorz | Grzegorz Kardaś | Composer | 1972 | 1 | |
| Khalaf, Raed | Raed Khalaf | Composer | 2000 | 1 | |
| Koder, Urban | Urban Koder | Composer | 1979 - 1992 | 2 | |
| Kunad, Rainer | Rainer Kunad | Composer | 1966 | 1 | |
| Karganoff, - | - Karganoff | Composer | 1922 | 1 | |
| Knabl, Rudolf G. | Rudolf G. Knabl | Composer | 1981 - 2008 | 7 | |
| Klíč, Josef | Josef Klíč | Composer | 2011 | 1 | 1 |
| Kjerulf, Halfdan | Halfdan Kjerulf | Composer | 1879 - 1925 | 3 | |
| Kücken, Friedrich Wilhelm | Friedrich Wilhelm Kücken | Composer | 1885 - 1888 | 3 | |
| Kontsky, - | - Kontsky | Composer | 1887 | 1 | |
| Krüger, Carl | Carl Krüger | Composer | 1921 | 1 | |
| Krohn, Max | Max Krohn | Composer | 1929 - 1935 | 2 | |
| Kannapinn, Friedrich | Friedrich Kannapinn | Composer | 1946 | 1 | |
| Kruse, Bjørn H. | Bjørn H. Kruse | Composer | 1991 | 38 | |
| Kopperud, Trond | Trond Kopperud | Composer | 1993 | 12 | |
| Kluften, Tonny | Tonny Kluften | Composer | 2001 | 1 | |
| Kodaly, Zoltán | Zoltán Kodaly | Composer | 2006 | 1 | |
| Kinkel, Gottfried | Gottfried Kinkel | Composer | 2006 - 2007 | 2 | |
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