In Old Chicago is a 1937 dramatic film. It tells the story of the Great Chicago Fire of 1871, with a fictionalized plot, the story of the two sons of Mrs. O'Leary (Alice Brady) (the owner of the cow which started the fire), one a rogue (Tyrone Power) the other a lawyer (Don Ameche). It also starred Alice Faye and Andy Devine.

The film was written by Sonya Levien and Lamar Trotti , from the Niven Busch story We The O'Learys. The film was directed by Henry King . At the time, it was one of the most expensive movies ever made.

The movie was nominated for the Academy Award for Best Picture. Alice Brady won the Oscar for Best Actress in a Supporting Role.