| 1 | Jane | Grey | A hairdresser. One of the airplane passengers. |
| | Cicely | Horbury | The countess. Aka: Cicely Bland, Lady Horbury. |
| | Madeleine | | Lady Horbury's maid. |
| | Normal | Gale | A dentist. One of the airplane passengers. |
| | Venetia Anne | Kerr | Stephen's childhood friend. One of the airplane passengers. |
| | Hercule | Poirot | The famous Belgian detective. Protagonist. |
| | Roger James | Bryant | A doctor. One of the airplane passengers. |
| | Jean | Dupont | Armand's son. One of the airplane passengers. |
| | Armand | Dupont | Jean's father. An archaeologist. |
| | Mr. | Clancy | The writer of detective stories. One of the airplane passengers. |
| | James Bell | Ryder | Mr. Clancy's seatmate.
Managing director cement company. |
| | Madame | Giselle | The victim. A well-known moneylender. |
| 2 | Henry C. | Mitchell | The senior steward. |
| | Albert | Davis | The junior steward. |
| 3 | Inspector | Japp | Poirot's colleague. A police inspector. |
| | Earl | Horbury | Cicely's husband. |
| 4 | Maitre A. | Thibault | Madame Giselle's lawyer. |
| | Henry | Winterspoon | The chief government analyst. |
| | Mr. | Wilson | The detective sergeant. |
| 6 | Mr. | Fourmier | A detective in Surete. |
| | Mr. | Giraud | Fourmier and Poirot's common friend. |
| | Elise | Grandier | Madame Giselle's maid. |
| 8 | George | Ebermann | James's partner. |
| | L. Marinner | | The person that Jean was supposed to meet. |
| 9 | Georges | | The man that Madame Giselle helped. |
| 11 | Mr. | Gilles | The chief of detective force in Surete. |
| | Jules | Perrot | The man who worked at the airlines. |
| | Silas | Harper | The mystery man who wants to lend money to Madame Giselle. |
| 12 | Andrew | Leech | The owner of Antoine's. |
| | Gladys | | Jane's friend. |
| | Jeanne | | The woman at the hairdresser's salon. |
| 14 | Mr. | Blunt | The colonel. |
| | Miss | Ross | Gale's acquaintance. |
| | Mrs. | Lorrie | Gale's
acquaintance. |
| 17 | Dorset | Mitchell | Henry's wife. |
| | John | Robinson | The man who blackmailed Cicely. |
| | Raymond | Barraclough | Cicely's lover. |
| 23 | Mere | Angelique | The head of Institute De Marie. |
| | Anne | Morisot | Madame Giselle's alleged daughter. Aka: Anne Richards. |
| | George | Leman | Giselle's husband. |
| 26 | John | Gale | Norman's uncle. |
