The Old Mill is a 1937 Silly Symphonies cartoon produced by Walt Disney, directed by Wilfred Jackson, scored by Leigh Harline, and released to theatres by RKO Radio Pictures on November 5, 1937. The film depicts the natural community of animals populating an old abandoned windmill in the country, and how they deal with a severe thunderstorm that nearly destroys their habitat. It incorporates the song "One Day When We Were Young" from` Johann Strauss II's operetta The Gypsy Baron.
Like many of the later Silly Symphonies, The Old Mill was a testing-ground for advanced animation techniques. Marking the first use of Disney's multiplane camera, the film also incorporates realistic depictions of animal behavior, complex lighting and color effects, depictions of rain, wind, lightning, ripples, splashes and reflections, three-dimensional rotation of detailed objects, and the use of timing to produce specific dramatic and emotional effects. All of the lessons learned from making The Old Mill would subsequently be incorporated into Disney's feature-length animated films, especially 1937's Snow White and the Seven Dwarfs.