- Killy Bertrand, Lighting Designer
- Kimonidou Iris, GNO Chorus Member, Soprano
- Kiouri Elena, Mezzo-Soprano
- Kirchner Klaus, Soloist, Baritone
- Kirk Florence, Soloist, Soprano
- Kirsanova Nina (Nina Vasilievna Vaner), Dancer, Choreographer
- Kissa Zoe, Soprano
- Kitsou Georgia, Soloist, Mezzo-Soprano
- Klironomos Evangelos, Conductor
- Klironomos Konstantinos, Soloist, Tenor
- Klonis Kleovoulos, Set Designer, Painter
- Klonovskaya Elizaveta, GNO Chorus Member, Mezzo-Soprano
- Klonovskiy Maxim, Soloist, Baritone
- Kloukina Komi, Dancer
- Kloukina Martha, Dancer, Choreographer, Kinesiologist
- Knell Hans Peter, Director
- Koch Wolfgang, Soloist, Bass-Baritone
- Kochno Boris, Librettist
- Kofou Vaia, GNO Chorus Member, Mezzo-Soprano
- Kogan Simeon, Conductor
- Kok George, Soloist, Tenor, Director
- Kokka Maria, Soloist, Soprano
- Kokkalis Nikos, Costume designer
- Kokkinopoulou Dimitra, Musician
- Kokkinopoulou-Kotsopoulou Loukia, Choreographer
- Kokkori-Deroze Helen, Soloist, Soprano
- Kokkos Yannis, Set Designer, Costume Designer
- Kokolios M., Soloist
- Kokolios-Bardi Giorgio, Soloist, Tenor
- Kokovika Ioanna, Soloist, Mezzo-Soprano
- Kolasi (Kolassanti) Irma, Mezzo-Soprano
- Kolasis Byron, Conductor, Violinist, Composer
- Koliopoulos Aristides, GNO Chorus Member, Bass
- Kolisoglou Andreas, Actor
- Kolydas Sotiris, GNO Chorus Member, Baritone
- Kolyva Marina, Soloist
- Komisopoulou Maria, Mezzo-Soprano
- Komisopoulou Maria, Soloist, Mezzo-Soprano
- Koniordou Lydia, Actress, Director
- Konstandinou Ileana, Soloist, Soprano
- Konstanta Maria, Actress
- Konstantaras Kostis, Soloist, Tenor
- Konstantinidou Filitsa
- Konstantinidou M., Soloist, Soprano
- Konstantinou Argyro
- Konstantinou Yannos, Soloist, Tenor
- Konstantinov Julian, Soloist, Bass
- Kontes Yannis, Lighting Designer
- Kontogeorgi Nandia, Actress, TV Hostess
- Kontora Danae, Soloist, Soprano
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