| Person | Type | Job | Role(s) |
|---|---|---|---|
 Cedric Gibbons | Crew | Art | Art Direction |
 E.J. Mannix | Crew | Production | Executive Producer |
Hans Rameau | Crew | Writing | Screenplay |
Harold F. Kress | Crew | Editing | Editor |
Herbert Stothart | Crew | Sound | Music |
 Irene | Crew | Costume & Make-Up | Costume Design, Costume Supervisor |
 Joseph Ruttenberg | Crew | Camera | Director of Photography |
 Mervyn LeRoy | Crew | Directing | Director |
 Paul Osborn | Crew | Writing | Screenplay |
 Sidney Franklin | Crew | Production | Producer |
Ève Curie | Crew | Writing | Writer |
 Al Ferguson | Cast | Actor | Man at Accident (uncredited) |
 Alan Napier | Cast | Actor | Dr. Bladh (uncredited) |
 Albert Bassermann | Cast | Actor | Professor Jean Perot |
 Almira Sessions | Cast | Actress | Madame Michaud (uncredited) |
 Arthur Shields | Cast | Actor | Businessman (uncredited) |
 C. Aubrey Smith | Cast | Actor | Lord Kelvin |
 Charles Trowbridge | Cast | Actor | Board Member (uncredited) |
Dickie Meyers | Cast | Master Michaud (uncredited) | |
Dorothy Raye | Cast | Nurse (uncredited) | |
 Edward Fielding | Cast | Actor | Board Member (uncredited) |
 Eustace Wyatt | Cast | Actor | Doctor (uncredited) |
 Francis Pierlot | Cast | Actor | Monsieur Michaud (uncredited) |
 Frederick Worlock | Cast | Actor | Businessman (uncredited) |
 Gene Lockhart | Cast | Actor | Bit Part (uncredited) |
 George Davis | Cast | Actor | Cart Driver (uncredited) |
 George Meader | Cast | Actor | Singing Professor (uncredited) |
 Gigi Perreau | Cast | Actress | Eve at 18 Months (uncredited) |
 Greer Garson | Cast | Actress | Marie Curie |
 Guy D'Ennery | Cast | Professor (uncredited) | |
 Henry Travers | Cast | Actor | Eugene Curie |
 Howard Freeman | Cast | Actor | Prof. Constant (voice) (uncredited) |
 Ilka Grüning | Cast | Actress | Seamstress (uncredited) |
 Isabel La Mal | Cast | Actress | Woman at Accident (uncredited) |
 James Hilton | Cast | Actor | Narration Spoken By (voice) |
 James Kirkwood | Cast | Actor | Board Member (uncredited) |
Leo Mostovoy | Cast | Photographer (uncredited) | |
 Lisa Golm | Cast | Actress | Lucille (uncredited) |
 Lumsden Hare | Cast | Actor | Professor Roget (uncredited) |
 Marek Windheim | Cast | Actor | Jewelry Salesman (uncredited) |
 Margaret O'Brien | Cast | Actress | Irene Curie - Age 5 |
Mariska Aldrich | Cast | Actress | Tall Woman (uncredited) |
María Pagés | Cast | Woman at Accident (uncredited) | |
 May Whitty | Cast | Actress | Madame Eugene Curie |
 Michael Visaroff | Cast | Actor | Proud Papa (uncredited) |
 Miles Mander | Cast | Actor | Businessman (uncredited) |
 Moroni Olsen | Cast | Actor | President of Businessman's Board (uncredited) |
Nita Pike | Cast | Woman at Accident (uncredited) | |
 Ray Collins | Cast | Actor | Lecturer (voice) (uncredited) |
 Ray Teal | Cast | Actor | Driver (uncredited) |
 Reginald Owen | Cast | Actor | Dr. Becquerel |
 Robert Walker | Cast | Actor | David Le Gros |
 Ruth Cherrington | Cast | Actress | Swedish Queen (uncredited) |
 Teddy Infuhr | Cast | Actor | Son (uncredited) |
Tony Carson | Cast | Actor | Man at Accident (uncredited) |
 Van Johnson | Cast | Actor | Reporter |
 Victor Francen | Cast | Actor | President of University |
 Walter Pidgeon | Cast | Actor | Pierre Curie |
 William Edmunds | Cast | Actor | Cart Driver (uncredited) |
 Wyndham Standing | Cast | Actor | King Oscar (uncredited) |
Harold De Becker | Cast | Professor (uncredited) | |
 Elsa Bassermann | Cast | Actress | Madame Perot |
Tay Dunn | Cast | Man at Accident (uncredited) | |
Marie Louise Gates | Cast | Perot Granddaughter (uncredited) | |
Franz Dorfler | Cast | Assistant Tailor (uncredited) | |
Justine Duney | Cast | Woman at Accident (uncredited) | |
Nestor Eristoff | Cast | Board Member (uncredited) | |
Linda Lee Gates | Cast | Perot Granddaughter (uncredited) | |
Noel Mills | Cast | Wedding Guest (uncredited) | |
| Person | Type | Job | Role(s) |
