- Kovalevsky M., Soloist
- 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
- Krinos George, Soloist, Tenor
- Kritsotaki Diamanti (Amanda), Soloist, Mezzo-Soprano
- Krnetić Zvonimir, Soloist, Tenor
- Kroussou Maria, Dancer
- Kucharsky Andrej, Soloist, Tenor
- Kuhn Konrad, Dramaturg
- Kunde Gregory, Soloist, Tenor
- Kvapil Jaroslav
- Kyanidou Sophia, Soprano
- Kyriaki Margarita, Soloist, Soprano
- Kyriakidou A., GNO Chorus Member, Soprano
- Kyriakidou Eirini
- Kyriakou Rena, Pianist, Composer
- Kyriakoulis Antonis, Set and Costume Designer
- Kyzlink Jaroslav, Conductor
- Lacey William, Conductor
- Lachmann Hedwig, Librettist
- Lacroix Christian, Designer
- Lafaras Vangelis, Dancer
- Lagger Peter, Soloist, Bass
- Lagoyianni Magda, Dancer
- Lahaj Rame, Soloist, Tenor
- Lalaouni Aggela, Soloist, soprano
- Lalaouni Alexandra, Musicologist, Music critic
- Laloussis Akis, Soloist, Baritone
- Lambrinos Theodore, Soloist, Baritone
- Lamperti Giorgio, Soloist, Tenor
- Lampeti(Loukou) Elli, Actress
- Landolfi Francesco, Soloist, Baritone
- Landou E.
- Langridge Stephen, Director
- Laoudi Dimitra, Dancer
- Lappas Ulysses/Ulisse, Soloist, Tenor
- Laskaratos Achilleas
- Laskaris Nikolaos, Librettist
- Latifi Blenti, Dancer
- Lavragas Dionysios, Composer
- Lazaridis Stefanos, Set Designer
- Lazarou Anastasios, Soloist, Baritone
- Lazos Christos, GNO Chorus Member, Baritone
- Lebherz Louis, Soloist, Bass
- Lee Colin, Soloist, Tenor
- Lee Joseph Francone, Director
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