 | Alec Guinness als Sidney Stratton |
 | Joan Greenwood als Daphne Birnley |
 | Cecil Parker als Alan Birnley |
 | Michael Gough als Michael Corland |
 | Ernest Thesiger als Sir John Kierlaw |
 | Vida Hope als Bertha |
 | Howard Marion-Crawford als Cranford |
 | Miles Malleson als The Tailor |
 | Henry Mollison als Hoskins |
 | Patric Doonan als Frank |
 | Duncan Lamont als Harry |
 | Harold Goodwin als Wilkins |
 | Colin Gordon als Hill |
 | Joan Harben als Miss Johnson |
 | Arthur Howard als Roberts |
| Roddy Hughes als Green |
 | Stuart Latham als Harrison |
 | Edie Martin als Mrs. Watson |
 | Mandy Miller als Gladdie |
 | Charlotte Mitchell als Mill Girl |
| Olaf Olsen als Knudsen |
 | Desmond Roberts als Mannering |
 | Ewan Roberts als Fotheringay |
| John Rudling als Wilson |
| Charles Saynor als Pete |
 | Russell Waters als Davidson |
 | Brian Worth als King |
 | George Benson als The Lodger |
| Frank Atkinson als The Baker |
| Charles Cullum als 1st Company Director |
| F.B.J. Sharp als 2nd Company Director |
| Scott Harrold als Express Reporter |
| Jack Howarth als Receptionist at Corland Mill |
 | Jack McNaughton als Taxi Driver |
 | Judith Furse als Nurse Gamage |
| Billy Russell als Nightwatchman |
| Andy Alston als Mill Worker (uncredited) |
| Jack Arrow als Mill Worker (uncredited) |
| David Boyd als Office Boy (uncredited) |
 | Jim Brady als Mill Worker (uncredited) |
| Harold Coyne als Mill Worker (uncredited) |
| Dan Cressey als Lab Technician (uncredited) |
| Alan Haines als Reporter (uncredited) |
| Laurence Hepworth als Chauffeur (uncredited) |
| Frank Howard als Mill Worker (uncredited) |
| Gertrude Kaye als Mill Worker (uncredited) |
| Jimmy Millar als Mill Worker (uncredited) |
 | Arthur Mullard als (uncredited) |
| Joe Phelps als Mill Worker (uncredited) |
| Johnny Rossi als Baker (uncredited) |
| Carol Wolveridge als Schoolgirl in Front of Class (uncredited) |
| Douglas Slocombe | Director of Photography |
| Roger MacDougall | Screenplay |
| Michael Balcon | Producer |
| Alexander Mackendrick | Director |
| Jeff Seaholme | Camera Operator |
| Arthur Bradburn | Sound Recordist |
| Anthony Mendleson | Costume Designer |
| Sidney Cole | Associate Producer |
| Harry Frampton | Makeup Artist |
| Jim Morahan | Art Direction |
| Geoffrey Dickinson | Special Effects |
| Barbara Barnard | Hairstylist |
| Bernard Gribble | Editor |
| L. C. Rudkin | Unit Production Manager |
| John Dighton | Screenplay |
| Felicia Manheim | Continuity |
| Ernest Taylor | Makeup Artist |
| Roger MacDougall | Theatre Play |
| Hal Mason | Production Supervisor |
| Geoffrey Myers | Scientific Consultant |
| David Peers | Assistant Director |
| Sydney Pearson | Special Effects |
| Benjamin Frankel | Original Music Composer |
| Alexander Mackendrick | Screenplay |
| Ernest Irving | Conductor |
| Stephen Dalby | Sound Supervisor |
| Lionel Banes | Additional Director of Photography |
| Margaret Harper Nelson | Casting |
| Daphne Martin | Assistant Hairdresser |
| John Assig | Second Assistant Director |
| Terry Bishop | Second Unit Director |
| Jim O'Connolly | Third Assistant Director |
| Norman Dorme | Draughtsman |
| Andrew Low | Set Dresser |
| Len Wills | Assistant Art Director |
| Mary Habberfield | Sound Editor |
| Norman King | Sound Engineer |
| Cyril Swern | Boom Operator |
| Geoffrey Dickinson | Visual Effects |
| Jack Dooley | Still Photographer |
| Ted Lockhart | Grip |
| Bob Penn | Still Photographer |
| Michael Shepherd | Clapper Loader |
| Ken Westbury | Assistant Camera |
| Hugh Wilson | Focus Puller |
| Thelma Graves | Casting Assistant |
| Ron Beck | Wardrobe Assistant |
| Edith Crutchley | Wardrobe Assistant |
| Ernie Farrer | Wardrobe Master |
| Lily Payne | Wardrobe Master |
| Lionel Selwyn | Assistant Editor |
