Mario Lanza
— Enrico Caruso
Ann Blyth
— Dorothy Benjamin
Dorothy Kirsten
— Louise Heggar
Jarmila Novotná
— Maria Selka
Richard Hageman
— Carlo Santi
Carl Benton Reid
— Park Benjamin
Eduard Franz
— Giulio Gatti-Casazza
Ludwig Donath
— Alfredo Brazzi
Alan Napier
— Jean de Reszke
Blanche Thebom
— Vocalist - Opera Montage
Teresa Celli
— Vocalist - Opera Montage
Nicola Moscona
— Vocalist - Opera Montage
Giuseppe Valdengo
— Vocalist - Opera Montage
Lucine Amara
— Vocalist - Opera Montage
Marina Koshetz
— Vocalist - Opera Montage
George Chakiris
— Dancer (uncredited)
Mae Clarke
— Woman (uncredited)
Bess Flowers
— Front Row Audience Member at 'Lucia di Lammermoor' (uncredited)
William Ripley Dorr
— Vocal Ensemble (uncredited)
Nestor Paiva
— Egisto Barretto
Hazel Dohlman
— Dowager (uncredited)
Pál Jávor
— Antonio Scotti
Carl Milletaire
— Gino
Shepard Menken
— Fucito
Vincent Renno
— Tullio
Peter Price
— Caruso (as boy)
Mario Siletti
— Papa Caruso
Angela Clarke
— Mama Caruso
Ian Wolfe
— Hutchins
Yvette Duguay
— Musetta Barretto