Melville A. Leven (born November 11, 1914, Chicago, Illinois; died December 17, 2007, California) known professionally as Mel Leven was an American composer and lyricist who had a long association with the Walt Disney Company, although he wrote songs for Peggy Lee ("Every Time"), The Andrews Sisters ("Commoners Boogy"), Nat King Cole, Dean Martin, and Les Brown, among others.

Leven's most famous song is arguably "Cruella de Vil" from the 1961 Disney animated feature One Hundred and One Dalmatians. That same year, he also wrote the story and new lyrics to sixteen tunes for the film Babes in Toyland. In later years, he wrote songs, stories, and did voice-over work for the PBS children's series Big Blue Marble, and well as working on a number of projects for television commercials.

Leven was also the original voice of Snoopy, and was in Snap, Crackle, Pop commercials. He also wrote the Little Ranger Nature series for Disney in the 1960s.

His work has been honored with two Emmy Awards and two Peabody Awards.

A conservationist and talented fly fisherman, in retirement Leven traveled the world in pursuit of fish and became a beloved fixture along Northern California rivers in particular. He features prominently in the 2009 documentary Rivers of a Lost Coast, on the decline of the California steelhead population.

According to his son, Leven died on December 17, 2007. He was 93.