Cannibal! The Musical (originally known as Alferd Packer: The Musical) is a 1993 American black comedy Western musical film directed, written, produced, co-scored by and starring Trey Parker in his directorial debut while studying at the University of Colorado at Boulder, before reaching fame with South Park alongside his friend Matt Stone who also stars in and produced the film. It is loosely based on the true story of Alfred "Alferd" Packer and the sordid details of the trip from Utah to Colorado that left his five fellow travelers dead and partially eaten. Trey Parker (credited as Juan Schwartz) stars as Alferd Packer, with frequent collaborators Stone, Dian Bachar, and others playing the supporting roles.

A live staged version was performed at Sierra College, in Rocklin, California, in May 1998. It was followed by Dad's Garage Theater, Atlanta Georgia, in the fall of 1998. The Dad's Garage version is highlighted in the special features of Troma's DVD release of the movie. The show has continued to find small theaters and audiences across America and beyond for many years. In 2001, a production was staged Off-Broadway at the Kraine Theater on East 4th Street in New York.

In 2011, producer Jason McHugh released a book titled Shpadoinkle: The Making of Cannibal! The Musical which chronicles all aspects of the creation and continuation of the Cannibal! The Musical cult phenomenon.