| Person | Type | Job | Role(s) |
|---|---|---|---|
 Agatha Christie | Crew | Writing | Novel, Author |
 Alan Cassie | Crew | Art | Art Direction |
 Andy Armstrong | Crew | Directing | Second Assistant Director |
 Anthony Powell | Crew | Costume & Make-Up | Costume Design |
 Anthony Shaffer | Crew | Writing | Screenplay |
Barrie Melrose | Crew | Production | Production Supervisor |
Barry Sandler | Crew | Writing | Writer |
Bill Rowe | Crew | Sound | Sound Recordist |
Bob Penn | Crew | Camera | Still Photographer |
Christopher Challis | Crew | Camera | Director of Photography |
 Cole Porter | Crew | Sound | Music |
 Derek Cracknell | Crew | Directing | First Assistant Director |
 Dyson Lovell | Crew | Production | Casting |
Elliot Scott | Crew | Art | Production Design |
Frank Walsh | Crew | Art | Set Designer |
 Guy Hamilton | Crew | Directing | Director |
Jill Carpenter | Crew | Costume & Make-Up | Makeup Artist |
John Brabourne | Crew | Production | Producer |
John Lanchbery | Crew | Sound | Music Arranger |
John Palmer | Crew | Camera | Camera Operator |
John W. Mitchell | Crew | Sound | Sound Recordist |
Nicholas Stevenson | Crew | Sound | Sound Editor |
Nobby Cross | Crew | Lighting | Gaffer |
Peter Howitt | Crew | Art | Set Decoration |
Richard Goodwin | Crew | Production | Producer |
Richard Marden | Crew | Editing | Editor |
Rosemary Burrows | Crew | Costume & Make-Up | Wardrobe Supervisor |
John Richards | Crew | Sound | Sound Recordist |
Ramon Gow | Crew | Costume & Make-Up | Hairdresser |
Jim Brennan | Crew | Production | Production Manager |
Roy Birchley | Crew | Editing | Assistant Editor |
Robin Browne | Crew | Camera | Camera Operator |
 Barbara Hicks | Cast | Actress | Flewitt's Secretary |
 Colin Blakely | Cast | Actor | Horace Blatt |
Cyril Conway | Cast | Actor | Police Surgeon |
 Denis Quilley | Cast | Actor | Kenneth Marshall |
 Diana Rigg | Cast | Actress | Arlena Stuart Marshall |
 Dimitri Andreas | Cast | Actor | Gino |
Emily Hone | Cast | Actress | Linda Marshall |
 James Mason | Cast | Actor | Odell Gardener |
 Jane Birkin | Cast | Actress | Christine Redfern |
 John Alderson | Cast | Actor | Police Sergeant |
 Maggie Smith | Cast | Actress | Daphne Castle |
 Nicholas Clay | Cast | Actor | Patrick Redfern |
Paul Antrim | Cast | Actor | Police Inspector |
 Peter Ustinov | Cast | Actor | Hercule Poirot |
 Richard Vernon | Cast | Actor | Flewitt |
 Robert Dorning | Cast | Actor | Concierge |
 Roddy McDowall | Cast | Actor | Rex Brewster |
 Sylvia Miles | Cast | Actress | Myra Gardener |
 Guy Standeven | Cast | Actor | Vicar on Train (uncredited) |
Walter Henry | Cast | Actor | Waiter (uncredited) |
Eric Kent | Cast | Actor | Desk Sergeant (uncredited) |
| Person | Type | Job | Role(s) |
