 Glenn FordDr. Thomas King | Dr. Thomas King |
 Eleanor ParkerMarjorie Lawrence | Marjorie Lawrence |
 Roger MooreCyril Lawrence | Cyril Lawrence |
 Cecil KellawayBill Lawrence | Bill Lawrence |
 Peter LeedsDr. Ed Ryson | Dr. Ed Ryson |
 Evelyn EllisClara | Clara |
 Walter BaldwinJim Owens | Jim Owens |
 Ann CodeeMme. Gilly | Mme. Gilly |
 Stuart WhitmanNot listed | Not listed |
| LLeopold SachseLeopold Sachse | Leopold Sachse |
 Eileen FarrellStudent at Mme. Gilly's / Voice of Marjorie Lawrence (voice) | Student at Mme. Gilly's / Voice of Marjorie Lawrence (voice) |
 Bess FlowersParty Guest (uncredited) | Party Guest (uncredited) |
| WWilliam OlvisDon José in 'Carmen' | Don José in 'Carmen' |
| MMarcella RealeMusetta in 'La bohème' | Musetta in 'La bohème' |
 Gilbert RussellManrico in 'Il trovatore' | Manrico in 'Il trovatore' |
| RRudolph PetrakTenor | Tenor |
 Gene RothKing Marke in 'Tristan und Isolde' (non-singing scene) | King Marke in 'Tristan und Isolde' (non-singing scene) |
| TTudor WilliamsKing Marke in 'Tristan und Isolde' (singing scene) | King Marke in 'Tristan und Isolde' (singing scene) |
| AArmando TokatianRodolfo in 'La bohème' | Rodolfo in 'La bohème' |
| EEdwin DunningMarcello in 'La bohème' | Marcello in 'La bohème' |
| JJeanne DetermannSoprano in 'Tristan und Isolde' | Soprano in 'Tristan und Isolde' |
| JJean BonacorsiContralto in 'Tristan und Isolde' | Contralto in 'Tristan und Isolde' |
| JJoseph GaudioSamson in 'Samson et Dalila' | Samson in 'Samson et Dalila' |
| CCharles GonzalesAlcindoro in 'La bohème' | Alcindoro in 'La bohème' |
 Stephen BekassyComte Claude des Vignaux | Comte Claude des Vignaux |
 Doris MerrickNurse (uncredited) | Nurse (uncredited) |
 Lomax StudyMetropolitan Stage Manager (uncredited) | Metropolitan Stage Manager (uncredited) |
 Leoda RichardsLady in Opera Audience | Lady in Opera Audience |
