- Karpouzi Evi, Dancer
- Kartalov Plamen, Director
- Karydis Yannis, Set designer, Painter
- Karydis Konstandinos, Pianist, Conductor
- Karydis Miltiadis, Conductor
- Karydis-Fuchs Aristides, Lighting Designer
- Karyotakis Theodoros, Composer
- Karytinos Lukas, Conductor
- Kasavetes Yorgos, Musician
- Kassioumis Dimitris, Soloist, Bass
- Kassaris Dimitris, Soloist, Baritone
- Kastelis St., Libretto Translator in Greek
- Kastrinaki Athena, Soloist, Mezzo-soprano
- Cathariou Angelica, Soloist, Mezzo-Soprano
- Katopodis Pantelis, Soloist, Bass
- Katranitsas Yannis, Set designer
- Katrivesi Maria, Actress
- Katsaras Konstantinos
- Katselis Pelos (Pelopidas), Actor, Director
- Katsibas Dimitris, Conductor
- Katsireli Elli, Soloist, Soprano
- Katsoula Ivana, Dancer
- Katsouli Mata, Soloist, Soprano, Conductor
- Katsoulis Michalis, Soloist, Baritone
- Katsoura Maria, Soprano
- Katzourakis Kyriakos, Painter, Set Designer, Costume Designer
- Kavallieratos Akis (Efthimios), Conductor
- Kavayas Vassilis, Soloist, Tenor
- Kavouras Yannis, Soloist, Tenor
- Kavrakos Dimitri, Soloist, Bass
- Kavrakos Dimitris, Soloist, Bass
- Kazantzakis Nikos, Writer
- Kazantzis Michalis, Soloist, Tenor
- Kechris Christos, 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
- 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
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