| Sylvia Sidney | Mrs. Verloc |
| Oskar Homolka | Her Husband |
| Desmond Tester | Her Young Brother |
| John Loder | Ted |
| Joyce Barbour | Renee |
| Matthew Boulton | Superintendent Talbot |
| S.J. Warmington | Hollingshead |
| William Dewhurst | The Professor |
| Frank Atkinson | Bit part |
| Arnold Bell | Bit part |
| Director | Alfred Hitchcock |
| Producer | Michael Balcon; Ivor Montagu |
| Writer | Joseph Conrad; Charles Bennett |
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