Keeper of the Flame is a 1942 American drama film directed by George Cukor, and starring Spencer Tracy and Katharine Hepburn, released by Metro-Goldwyn-Mayer (MGM). The screenplay by Donald Ogden Stewart is adapted from the 1942 novel Keeper of the Flame by I. A. R. Wylie. Hepburn plays the widow of a famous civic leader who has died in an accident. Tracy portrays a former war correspondent who intends to write a flattering biography of the dead man, only to find that his death is shrouded in mystery. Screenwriter Stewart considered the script the finest moment of his career, feeling vindicated by the assignment as he believed that Hollywood had punished him for years for his political views. Principal filming began in the last week of August 1942, four months after the release of the novel, published by Random House. The picture was filmed on a sound stage, with no location shooting. Hepburn had already begun a relationship with Tracy, and his heavy drinking led her to become his vigilant guardian during the filming.

Spencer Bonaventure Tracy was an American actor. He was known for his natural performing style and versatility. One of the major stars of Hollywood's Golden Age, Tracy was the first actor to win two consecutive Academy Awards for Best Actor, from nine nominations. During his career, he appeared in 75 films and developed a reputation among his peers as one of the screen's greatest actors. In 1999, the American Film Institute ranked Tracy as the 9th greatest male star of Classic Hollywood Cinema.