 Kim NovakCarly Hardwicke | Carly Hardwicke |
 Jack LemmonBill Gridley | Bill Gridley |
 Fred AstaireFranklyn Ambruster | Franklyn Ambruster |
 Lionel JeffriesInspector Oliphant | Inspector Oliphant |
 Estelle WinwoodMrs. Dunhill | Mrs. Dunhill |
 Maxwell ReedMiles Hardwicke | Miles Hardwicke |
 Philippa BevansAgatha Brown | Agatha Brown |
 Henry DaniellStranger | Stranger |
 Ronald LongCoroner | Coroner |
| RRichard PeelDillings | Dillings |
 Doris LloydLady Fallott | Lady Fallott |
 Bess FlowersCourtroom Spectator (uncredited) | Courtroom Spectator (uncredited) |
 Leoda RichardsTrial Spectator (uncredited) | Trial Spectator (uncredited) |
| IIris BristolAgatha (uncredited) | Agatha (uncredited) |
| LLeon AltonCourtroom Spectator (uncredited) | Courtroom Spectator (uncredited) |
 Al BainCourtroom Spectator (uncredited) | Courtroom Spectator (uncredited) |
 Frank BakerBar Patron (uncredited) | Bar Patron (uncredited) |
| BBrandon BeachJuror (uncredited) | Juror (uncredited) |
 Marjorie BennettAutograph Seeker (uncredited) | Autograph Seeker (uncredited) |
 Barry BernardAttendant (uncredited) | Attendant (uncredited) |
| PPaul BradleyLamplighter Patron (uncredited) | Lamplighter Patron (uncredited) |
| RRoss BrownBoy (uncredited) | Boy (uncredited) |
| WWilliam BurnsideBar Patron (uncredited) | Bar Patron (uncredited) |
| BBoyd CabeenLamplighter Patron (uncredited) | Lamplighter Patron (uncredited) |
| CCharles CirilloCourtroom Spectator (uncredited) | Courtroom Spectator (uncredited) |
| LLaurence ConroyClerk (uncredited) | Clerk (uncredited) |
| PPaul CristoLamplighter Patron (uncredited) | Lamplighter Patron (uncredited) |
| DDick CrockettDetective Carstairs (uncredited) | Detective Carstairs (uncredited) |
| OOgden DangerfieldReporter (uncredited) | Reporter (uncredited) |
| SScott DaveyHenry (uncredited) | Henry (uncredited) |
