| Kammeroper Konstanz | Konstanz, Germany | FestivalView profile |
| Kammeroper Schloss Rheinsberg | Rheinsberg, Germany | FestivalView profile |
| Kamraterna | Arsta, Sweden | FestivalView profile |
| Kilkenny Arts Festival | Kilkenny, Ireland | FestivalView profile |
| Killaloe Music Festival | Ireland | FestivalView profile |
| Kintai Music Festival | Klaipėda, Lithuania | FestivalView profile |
| Kirsten Flagstad Festival | Hamar, Norway | FestivalView profile |
| Kissinger Sommer Festival | Bad Kissingen, Germany | FestivalView profile |
| Klangvokal Musikfestival Dortmund | Germany | FestivalView profile |
| Klara Festival | Brussels, Belgium | FestivalView profile |
| Klarafestival | Belgium | FestivalView profile |
| Klassik Festival Schloss Kirchstetten | Kirchstetten, Austria | FestivalView profile |
| Kleine Oper am See | Uberlingen, Germany | FestivalView profile |
| Klosters Music | Switzerland | FestivalView profile |
| Komische Oper Festival | Berlin, Germany | FestivalView profile |
| Konzerte im Fronhof | Augsburg, Germany | FestivalView profile |
| Konzertreihe Berger Kirche | Stuttgart, Germany | FestivalView profile |
| Korea Opera Festival | Seoul, South Korea | FestivalView profile |
| Krakow Opera Summer Festival | Krakow, Poland | FestivalView profile |
| Kromer Festival Biecz | Biecz, Poland | FestivalView profile |
