Saturday's Warrior is a Latter-day Saint (Mormon) musical written by Douglas Stewart and Lex de Azevedo. The musical tells the story of a group of children that are born into a Mormon family after making various promises in the pre-existence. Two of the children, Jimmy and Julie, encounter personal struggles that help them rediscover and fulfill their foreordained missions in life. Although an explicit timeframe is not given in the dialogue, certain contextual clues (in particular, a song that demonizes the Zero population growth movement) suggest that the story takes place in the late 1960s or early 1970s. The musical explores the Mormon doctrines of pre-existence, foreordination, and eternal marriage. It also depicts abortion and birth control as being contrary to the divine plan of salvation.

Saturday's Warrior was first performed in California in 1973 as a college project.[1] In 1989, Bob Williams made a video version of the musical, setting it on a stage as opposed to giving the movie a more naturalistic look. It is among the first popular LDS films to not be made or sponsored by The Church of Jesus Christ of Latter-day Saints or Brigham Young University.[1]

A sequel, The White Star, debuted in 2007.

Although Saturday's Warrior is considered a classic in the Mormon community,[3] particularly in the Mormon Corridor, it is not well known in the rest of the world. The themes of Saturday's Warrior resound with many Latter-day Saints—that everyone is a literal child of God, and in remembering this, they will be better able to hold on to their morals and beliefs as they are increasingly criticized and ridiculed especially now, in what is called "the last days" (hence the title, Saturday's Warrior -- Saturday being the last day of the week, an allegory for the last days). It also emphasizes the belief that though their morals may seem restrictive, these morals actually give them more freedom. At the same time, Saturday's Warrior is notable for being a popular source of unsanctioned doctrine not taught by the LDS Church - such as pre-existence-founded romantic relationships reaching fruition during mortality, and families being together before they come to the earth.