 Jan KoecherStanisław Moniuszko | Stanisław Moniuszko |
 Jerzy DuszyńskiWłodzimierz Wolski | Włodzimierz Wolski |
 Barbara KostrzewskaPaulina Rivoli | Paulina Rivoli |
 Nina AndryczMaria Kalergis | Maria Kalergis |
 Danuta SzaflarskaCountess Krystyna | Countess Krystyna |
 Janusz WarneckiProfessor | Professor |
 Jan KurnakowiczProf. Jan Quatrini | Prof. Jan Quatrini |
 Stanisław ŻeleńskiJózef Sikorski, music critic | Józef Sikorski, music critic |
 Gustaw BuszyńskiTheater Director Ignacy Abramowicz | Theater Director Ignacy Abramowicz |
 Zdzisław MrożewskiCount Alfred (as Z. Morzewski) | Count Alfred (as Z. Morzewski) |
 Tadeusz CyglerJulian Dobrski | Julian Dobrski |
| WWacław DomienieckiItalian Tenor | Italian Tenor |
| JJózef KarbowskiSecretary | Secretary |
 Jan CiecierskiBishop | Bishop |
 Kazimierz OpalińskiTheater Records-keeper | Theater Records-keeper |
 Ludwik SempolińskiKlimowicz | Klimowicz |
 Krystyna KarkowskaMagdalenka | Magdalenka |
 Halina Billing-WohlMoniuszka (wife) | Moniuszka (wife) |
 Wacław Ścibor-RylskiSacchetti | Sacchetti |
 Aleksander GąssowskiJefimow | Jefimow |
 Henryk ModrzewskiSennewald | Sennewald |
 Zenon BurzyńskiTunio | Tunio |
 Ludwik BenoitSculptor | Sculptor |
| ZZdzisław SzymańskiReporter | Reporter |
| MMieczysław PawlikowskiMusician | Musician |
 Tadeusz PlucińskiPainter | Painter |
 Ryszard BaryczPoet | Poet |
 Emil KarewiczGeorg | Georg |
| JJan Zielinskistage manager | stage manager |
 Bronisław DarskiPorter (uncredited) | Porter (uncredited) |
