- Kechris Christos, Soloist, Tenor
- Kechulius Stephen, Soloist, Baritone, Pianist, Composer
- Kefala Hara, Actor, Soloist, Soprano
- Kehagias Marios, Member of GNO Children's Chorus
- Kelessidi Elena, Soloist, Soprano
- Kelly Janis, Soloist, Soprano
- Kendaka Lili, Set and Costume Designer
- Kentros Giorgos, Actor
- Kerestetzi-Vlastaraki Maria, Soloist, soprano
- Kerl Torsten, Soloist, Tenor
- Kessoulis Ion, Director
- Keuten Serge, Dancer, Choreographer, Director
- Khudoley Mlada, Soloist, Soprano
- Kikna Vasiliki, Dancer, Choreographer
- Kikou Katerina, Dancer
- 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
- Kirsten Johan, Soloist, Bass-baritone
- 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, Soloist, Mezzo-Soprano
- Kolasis Byron, Conductor, Violinist, Composer
- Koliopoulos Aristides, GNO Chorus Member, Bass
- Kolios Yorgos, Set designer
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