Fantasia is a 1940 American animated film produced by Walt Disney and released by Walt Disney Productions. With story direction by Joe Grant and Dick Huemer, and production supervision by Ben Sharpsteen, it is the third Disney animated feature film. The film consists of eight animated segments set to pieces of classical music conducted by Leopold Stokowski, seven of which are performed by the Philadelphia Orchestra. Music critic and composer Deems Taylor acts as the film's Master of Ceremonies, providing a live-action introduction to each animated segment.

Disney settled on the film's concept in 1938 as work neared completion on The Sorcerer's Apprentice, an elaborate Silly Symphonies short designed as a comeback role for Mickey Mouse, who had declined in popularity. As production costs grew higher than what it could earn, Disney decided to include the short in a feature-length film with other segments set to classical pieces. The soundtrack was recorded using multiple audio channels and reproduced with Fantasound, a pioneering sound reproduction system that made Fantasia the first commercial film shown in stereophonic sound.

Fantasia was first released as a theatrical roadshow held in thirteen U.S. cities from November 13, 1940. While acclaimed by critics, it was unable to make a profit due to World War II cutting off distribution to the European market, the film's high production costs, and the expense of leasing theatres and installing the Fantasound equipment for the roadshow presentations. The film was subsequently reissued multiple times with its original footage and audio being deleted, modified, or restored in each version. Fantasia is the 23rd highest-grossing film of all time in the U.S. when adjusted for inflation. The Fantasia franchise has grown to include video games, Disneyland attractions, and a live concert series. A sequel, Fantasia 2000, co-produced by Roy E. Disney, was released in 1999. Fantasia has grown in reputation over the years and is now widely acclaimed; in 1998 the American Film Institute ranked it as the 58th greatest American film in their 100 Years...100 Movies and the fifth greatest animated film in their 10 Top 10 list. In 1990, Fantasia was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant".