Mahler is a 1974 British biographical film based on the life of Austro-Bohemian composer Gustav Mahler. It was written and directed by Ken Russell for Goodtimes Enterprises, and starred Robert Powell as Gustav Mahler and Georgina Hale as Alma Mahler. The film was entered into the 1974 Cannes Film Festival, where it won the Technical Grand Prize.

Henry Kenneth Alfred Russell was a British film director, known for his pioneering work in television and film and for his flamboyant and controversial style. His films were mainly liberal adaptations of existing texts, or biographies, notably of composers of the Romantic era. Russell began directing for the BBC, where he made creative adaptations of composers' lives which were unusual for the time. He also directed many feature films independently and for studios.