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The Metro-Goldwyn-Mayer cartoon studio (also commonly referred to as MGM Cartoons) was an American animation studio operated by Metro-Goldwyn-Mayer during the Golden Age of American animation. Active from 1937 until 1957, the studio was responsible for producing animated shorts to accompany MGM feature films in Loew's Theaters, which included popular cartoon characters and series such as William Hanna and Joseph Barbera's Tom and Jerry series and Tex Avery's Droopy.
Prior to forming its own cartoon studio, MGM released the work of independent animation producer Ub Iwerks, and later the Happy Harmonies series from Hugh Harman and Rudolf Ising. The MGM cartoon studio was founded to replace Harman and Ising, although both men eventually became employees of the studio. After a slow start, the studio began to take off in 1940 after its short The Milky Way became the first non-Disney cartoon to win the Academy Award for Best Short Subjects: Cartoons. The studio's roster of talent benefited from an exodus of animators from the Warner Bros. and Disney studios, who were facing issues with union workers. Originally established and run by executive Fred Quimby, Hanna and Barbera became the heads of the studio in 1955 following Quimby's retirement. The cartoon studio was closed on May 15, 1957, at which time Hanna and Barbera took much of the staff to form their own company, Hanna-Barbera Productions, then named H-B Enterprises.