| Gilbert | Adrian | Robin's father. Hedy's friend. Aka: Adrian. |
| Wolf | Albach-Retty | One of Hedy's former admirers. |
| Jimmy | Alvarez | Manager of local tavern. Hedy and Gene's
wedding witness. |
| Boski | Antheil | George's wife. |
| George | Antheil | A well-known composer. Hedy's instrument co-inventor. |
| Otto | Baeur | The Jewish leader of Schutzbund. |
| Joan | Bennett | An actress. Gene's wife. |
| Charles | Boyer | A French actor. Hedy's leading man. |
| William | Bullitt | George's source. A journalist and a diplomat. |
| Mrs. | Burton | Jamesie's nanny. |
| John | Cromwell | Hedy's director in her first movie with MGM. |
| Dr. | Devitt | A doctor who lives in Dobling. Emil's doctor. |
| Engelbert | Dollfuss | A federal chancellor in Austria. |
| Emil | Fey | Vice Chancellor of Austria. |
| Victor | Fleming | One of Hedy's film directors. |
| Francisco | Franco | A former caudillo of Spain. A military dictator of Spain. |
| Sigmund | Freud | A celebrated psychologist. |
| Reggier | Gardiner | An actor that Hedy dated. |
| John | Garfield | Hedy's co-actor. |
| Janey | Gaynor | An actress. Adrian's wife. |
| Robin | Gaynor-Adrian | Gilbert's son. |
| Irene | Gibbons | A costume designer in Theatre an der wien. |
| Adolf | Hitler | The Leader of the Nazi Party. Mr. Mandl's client. |
| Josef | Hoffman | The architect of Hotel Imperial. |
| Arthur | Hornblow Jr. | Hedy and Gene's close friend. |
| John | Howard | An actor Hedy dated. |
| Howard | Hughes | A business tycoon Hedy dated. |
| Hans | Jaray | A stage actress who played the role of Empress Elizabeth. |
| Hedwig | Keiler-Mandl | A stage actress. Protagonist and Narrator. Aka: Hedy Lamarr. |
| Charles | Kettering | The head of the National Inventor's Council. |
| Emil | Kiesler | Hedy's father. |
| Gertrude | Kiesler | Hedy's mother. Aka: Trude. |
| Barbara | La Marr | A silent film star who died of heroin. |
| James L. | Markey | Hedy and Gene's adoptive son. Aka: Jamesie. |
| Lawrence | Langner | A council member who supports Hedy and George's invention. |
| L.B | Lent | Chief Engineer of the National Inventor's Council. |
| Peter | Lorre | Hedy's actor friend. |
| Myrna | Loy | Hedy and Gene's close friend. |
| Else | Lubbig | A veteran dresser in Theatre an der wien. |
| Gustav | Machaty | Director who won the best director award in Venice Film Festival. |
| Friedrich | Mandl | Hedy's husband. The richest man in Vienna. Aka: Fritz. |
| Gene | Markey | A screenwriter. Hedy's new husband. |
| Ilona | Massey | A Hungrian actress. Hedy's roommate. |
| Raul | Mateus | Police department head. One of Hedy's wedding witnesses. |
| Eva | May | A young German actress who commits suicide. |
| Louis | Mayer | The head and founder of MGM studio. Margaret's husband. |
| Margaret | Mayer | The head of MGM studio. Louis's wife. |
| Samuel | McKeown | A Caltech professor. |
| Aribert | Mog | Hedy's co-actor. Hedy's suitor. |
| Nicolo | Montello | One of the proprietors of Hotel Excelsior. |
| George | Montgomery | Hedy's new boyfriend. |
| Benito | Mussolini | Prime Minister of Italy. Mr. Mandl's associate. Aka: II Duce. |
| Apolonia | Nunez | The Mexican civil magistrate. |
| Gustavo | Padres Jr. | Mexican consul. One of Hedy and Gene's wedding witnesses. |
| Frances | Perkins | A woman who works on the topic of legislation reform. |
| William | Powell | Hedy's co-star. |
| Otto | Preminger | A famous director. |
| Cecilia | Razovsky | The chair of the advisory committee to the secretary of labor. |
| Max | Reinhardt | Hedy's theatre mentor. |
| Eddie | Rhodes | A young sailor Hedy kissed in front of her audience. |
| Robert | Ritchie | An MGM talent scout. |
| Mr. | Robson | One of L.B. Lent's workers. |
| President | Roosevelt | The current U.S. President. |
| Kate | Rosenheim | The head of Germany's department of Children's emigration. |
| Madame | Schiaparelli | A famous designer. |
| Joseph | Schildkraut | Hedy's co-actor. |
| Reinhold | Schunzel | The MGM director. |
| Colonel | Smith | Assistant to the chief procurement officer of the Navy. |
| Mrs. | Stein | One of Hedy's neighbors. |
| Howard | Strickling | Mr. Mayer's press representative. |
| Benny | Thau | Mr. Mayer's assistant head. |
| Spencer | Tracy | Hedy's co-actor. |
| Franz | V. Hochstetten | An Aristocratic ritter. One of Hedy's suitors. |
| Kurt | V. Schuschnigg | A political leader. The new Austrian Chancellor. |
| Ernst Rudiger | Starhemberg | Head of Heimwehr. Mr. Mandl's friend and business colleague. |
| Ferdinand | Starhemberg | Prince Ernst's brother. Hedy's lover. |
| King | Vidor | One of Hedy's film directors. |
| Odon | Von Horvath | A renowned writer. |
| Blucher | Von Wahlstaff | One of Hedy's former admirers. |
| Hellmuth | Walter | A German engineer. A Nazi torpedo expert. |
| Walter | Wanger | A film producer. |
| Summer | Welles | Secretary of the state. President Roosevelt's favorite. |
| Franz | Werfel | A renowned writer. |
| Jock | Whitney | A playboy Hedy dated. |
| James | Wong Howe | A cinematographer at MGM. |
| Ada | | The pretty parlormaid. |
| Albrecht | | The Prince of Bavaria. |
| Auguste | | The youngest servant of Hedy whom she trusts. |
| Blanche | | Hedy's housekeeper. |
| Donner | | Gene and Hedy's great dane. |
| Gustav | | The Prince of Denmark. |
| Josef | | A stage actor who played the role of Emperor Franz. |
| Laura | | Hedy's new maid. |
| Nicholas | | The Prince of Greece. |
| Scheneider | | The most senior servant of Mr. Mandl and Hedy. |
| Susie | | Hedy's makeup artist. |
