| Warner Oland | ... | Charlie Chan | |
| Boris Karloff | ... | Gravelle | |
| Keye Luke | ... | Lee Chan | |
| Charlotte Henry | ... | Mlle. Kitty | |
| Thomas Beck | ... | Phil Childers | |
| Margaret Irving | ... | Mme. Lilli Rochelle | |
| Gregory Gaye | ... | Enrico Barelli | |
| Nedda Harrigan | ... | Mme. Anita Barelli | |
| Frank Conroy | ... | Mr. Whitely | |
| Guy Usher | ... | Inspector Regan | |
| William Demarest | ... | Sergeant Kelly | |
| Maurice Cass | ... | Mr. Arnold | |
| Tom McGuire | ... | Morris | |
| rest of cast listed alphabetically: | |||
| William Bailey | ... | Detective (uncredited) | |
| Charles Bancroft | ... | Soldier in Opera (uncredited) | |
| John Bleifer | ... | Murdered Orderly (uncredited) | |
| Stanley Blystone | ... | Backstage Cop (shoots Gravelle) (uncredited) | |
| Myrta Bonillas | ... | Villager in Opera (uncredited) | |
| Raymond Brown | ... | Guard (uncredited) | |
| Carita Crawford | ... | Dancer in Opera (uncredited) | |
| Patrick Cunning | ... | Villager in Opera (uncredited) | |
| Zari Elmassian | ... | Mme. Rochelle (uncredited) (singing voice) | |
| Frank Fanning | ... | Cop (uncredited) | |
| Jim Farley | ... | Detective (uncredited) | |
| Adolph Faylauer | ... | Opera Spectator (uncredited) | |
| Larry Fisher | ... | Cop (uncredited) | |
| Benson Fong | ... | Opera Supernumerary (uncredited) | |
| J.C. Fowler | ... | Opera Spectator (uncredited) | |
| Otto Fries | ... | Innkeeper (uncredited) | |
| Bud Geary | ... | Cop (uncredited) | |
| Milton Gowman | ... | Villager in Opera (uncredited) | |
| Herschel Graham | ... | Villager in Opera (uncredited) | |
| Harrison Greene | ... | Detective (uncredited) | |
| Julia Griffith | ... | Opera Spectator (uncredited) | |
| Cliff Herd | ... | Stagehand (uncredited) | |
| Charles Anthony Hughes | ... | Ambulance Doctor (uncredited) | |
| Selmer Jackson | ... | Hudson - Wire-Photo Technician (uncredited) | |
| Gladden James | ... | Regan's Secretary (uncredited) | |
| Jane Keckley | ... | 2nd Wardrobe Woman (uncredited) | |
| Fred Kelsey | ... | Dugan, Policeman (uncredited) | |
| Marc Lawrence | ... | Undetermined Minor Role (uncredited) (unconfirmed) | |
| Karl Malden | ... | Hospital Attendant (uncredited) | |
| Leonard Mellon | ... | Villager in Opera (uncredited) | |
| Tony Merlo | ... | Villager in Opera (uncredited) | |
| Dodo Newton | ... | Barmaid in Opera (uncredited) | |
| Eddie Parker | ... | Cop (uncredited) | |
| Richard Powell | ... | Cop (uncredited) | |
| Enrique de Rosas | ... | Florist (uncredited) | |
| Tony Roux | ... | Villager in Opera (uncredited) | |
| Dick Rush | ... | Detective (uncredited) | |
| Alexander Schoenberg | ... | Prompter (uncredited) | |
| Eddie Shubert | ... | Guard (uncredited) | |
| Lee Shumway | ... | Sanatarium Guard (uncredited) | |
| Mary Louise Smith | ... | Villager in Opera (uncredited) | |
| Harry Strang | ... | Cop (uncredited) | |
| Eddie Tamblyn | ... | Call Boy (uncredited) | |
| Marjorie Timm | ... | Villager in Opera (uncredited) | |
| Harland Tucker | ... | Private Detective (uncredited) | |
| Hilda Vaughn | ... | Agnes - Wardrobe Woman (uncredited) | |
| Emmett Vogan | ... | Smitty - Wire-Photo Technician (uncredited) | |
| Billy Wayne | ... | Electrician (uncredited) | |
| Tudor Williams | ... | Gravelle's Singing Voice (uncredited) (voice) | |
| Joan Woodbury | ... | Dancer in Opera (uncredited) | |
Directed by | |||
| H. Bruce Humberstone | |||
Writing credits | ||
| Scott Darling | (screen play) and | |
| Charles Belden | (screen play) (as Charles S. Belden) | |
| Bess Meredyth | (from a story by) | |
| Earl Derr Biggers | (based on the character created by: "Charlie Chan") | |
Produced by | |||
| John Stone | .... | associate producer | |
Original Music by | |||
| Charles Maxwell | (uncredited) | ||
Cinematography by | |||
| Lucien N. Andriot | (photography) | ||
Film Editing by | |||
| Alex Troffey | (film editor) | ||
Art Direction by | |||
| Duncan Cramer | |||
| Lewis H. Creber | (as Lewis Creber) | ||
Costume Design by | |||
| Herschel McCoy | (costumes) (as Herschel) | ||
Second Unit Director or Assistant Director | |||
| Sol Michaels | .... | assistant director | |
Sound Department | |||
| Harry M. Leonard | .... | sound | |
| George Leverett | .... | sound | |
Costume and Wardrobe Department | |||
| Sam Benson | .... | wardrobe (uncredited) | |
Music Department | |||
| Samuel Kaylin | .... | musical director | |
| William Kernell | .... | librettist | |
| Oscar Levant | .... | composer: Opera "Carnival" | |
| Charles Maxwell | .... | orchestrator | |
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| Charlie Chan at the Wax Museum | Charlie Chan at Monte Carlo | Charlie Chan at the Olympics | Charlie Chan in The Chinese Cat | Charlie Chan at the Race Track |
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| Full cast and crew | Company credits | External reviews |
| IMDb Comedy section | IMDb USA section |
According to the extended credits on here, Boris Karloff's singing is dubbed by someone named Tudor Williams.
He sounds very much like Lawrence Tibbett, the most popular baritone at the Metropolitan Opera in the mid-1930s, and a singer who would have been known to general movie-going audiences then through radio, recordings, and his own movies. One of the other posters mentions that the dumpy costume worn during the performance by Boris Karloff and the baritone he replaces was a costume of Tibbett's. Tibbett's movie studio was Fox, and he made what was probably his most successful movie for them, Metropolitan, the same year as CC at the Opera.
Is it possible that "Tudor Williams" was a cover for Lawrence Tibbett?????