- Kotzailia Calliope, Soloist, Soprano
- Koukos Periklis, Composer
- Koukoutaras Yannis, Soloist, Baritone
- Koulloumbi Vassiliki, GNO Chorus Member, Soprano
- Kouloumbi Christina, Set and Costume Designer
- Kouloumbis Andreas, Soloist, Baritone
- Kouloumbis Victoras
- Koumantareas Menis, Literary Writer
- Koumendakis Giorgos
- Kounadis Argyris, Composer
- Kountouris Ioannis, GNO Chorus Member, Baritone
- Kountouris Vassilis, GNO Chorus Member, Baritone
- Kouphochristou Nina, Soloist, Soprano
- Kourachani Mitsa-(Mitsi), Soloist, Soprano
- Kourakou Mary, Soloist, Soprano
- Kourkoulou Vanessa, Dancer
- Kouroupakis Petros, Dancer
- Kouroupos Giorgios, Composer
- Kourousopoulos Loudovikos, Soloist, Tenor
- Kourpas Panagiotis, Lighting Designer
- Kousakis Yorgos, Member of GNO Children's Chorus
- Kousi Emilia, GNO Chorus Member, Mezzo-soprano
- Kousouni Maria, Dancer
- Koutelieris Zafiris, Soloist, Baritone
- Koutsoumbi Eleni
- Kovač Vera, Soloist, Soprano
- Kovalevsky M., Soloist
- Kowaljow Vitalij, Soloist, Bass
- Koxon Richard, Soloist, Tenor
- Krassa Ekaterini, Soloist, Soprano
- Krassakopoulos Yannis, Soloist, Tenor
- Krenek Ernst, Composer
- Krief Denis, Director, Set designer, Costume designer, Lighting designer
- Krilovici Marina, Soloist, Soprano
- Krinos George, Soloist, Tenor
- Kritsotaki Diamanti (Amanda), Soloist, Mezzo-Soprano
- Krnetić Zvonimir, Soloist, Tenor
- Kroussou Maria, Dancer
- Ksinidis E., Soloist, Tenor
- Kucharsky Andrej, Soloist, Tenor
- Kuhn Konrad, Dramaturg
- Kunde Gregory, Soloist, Tenor
- Kvapil Jaroslav, Librettist
- Kyanidou Sophia, Soloist, Soprano
- Kypriotis Alkinoos
- Kyriaki Margarita, Soloist, Soprano
- Kyriakidou A., GNO Chorus Member, Soprano
- Kyriakidou Eirini, Soloist, Soprano
- Kyriakou Rena, Pianist, Composer
- Kyriakoulis Antonis, Set and Costume Designer
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