• Mike Myers as:
• Eddie Murphy as Donkey
• Cameron Diaz as Princess Fiona
• John Lithgow as Lord Farquaad
• Vincent Cassel as "Monsieur" Robin Hood
• Conrad Vernon as Gingerbread Man
• Chris Miller as:
• Cody Cameron as:
• Simon J. Smith as Blind Mouse
• Christopher Knights as:
• Aron Warner as Big Bad Wolf
• Jim Cummings as Captain of the Guards
• Kathleen Freeman as Old Woman
• Andrew Adamson as Duloc Mascot
• Bobby Block as Baby Bear from the Three Bears
• Michael Galasso as Peter Pan

At the time DreamWorks Pictures was founded, producer John H. Williams got hold of the book from his children and when he brought it to DreamWorks, it caught CEO Jeffrey Katzenberg's attention and the studio decided to make it into a film. Recounting the inspiration of making the film, Williams said:

Every development deal starts with a pitch and my pitch came from my then kindergartner, in collaboration with his pre-school brother. Upon our second reading of Shrek, the kindergartner started quoting large segments of the book pretending he could read them. Even as an adult, I thought Shrek was outrageous, irreverent, iconoclastic, gross, and just a lot of fun. He was a great movie character in search of a movie.

After buying the rights to the film, Katzenberg quickly put it in active development in November 1995. Steven Spielberg had thought about making a traditionally animated film adaptation of the book before, when he bought the rights to the book in 1991 before the founding of DreamWorks, where Bill Murray would play Shrek and Steve Martin would play Donkey. In the beginning of production, co-director Andrew Adamson refused to be intimidated by Katzenberg and had an argument with him about how much the film should appeal to adults. Katzenberg wanted both audiences, but he deemed some of Adamson's ideas, such as adding sexual jokes and Guns N' Roses music to the soundtrack, to be too outrageous. Adamson and Kelly Asbury joined in 1997 to co-direct the film. However, Asbury left a year later for work on the 2002 film Spirit: Stallion of the Cimarron, and was replaced with story artist Vicky Jenson, although Asbury would later co-direct the sequel. Both Adamson and Jenson decided to work on the film in half, so the crew could at least know whom to go to with specific detail questions about the film's sequences; "We both ended up doing a lot of everything," Adamson said. "We're both kinda control freaks, and we both wanted to do everything."

Some early sketches of Shrek's house were done between 1996 and 1997 using Photoshop, with the sketches showing Shrek first living in a garbage dump near a human village called Wart Creek. It was also thought at one time that he would live with his parents and keep rotting fish in his bedroom. Donkey was modeled after Pericles (born 1994; died 2025; also known as Perry), a real miniature donkey from Barron Park in Palo Alto, California. Raman Hui, supervising animator of Shrek, stated that Fiona "wasn't based on any real person" and he did many different sketches for her. He had done over 100 sculptures of Fiona before the directors chose the final design. In early development, the art directors visited Hearst Castle, Stratford upon Avon, and Dordogne for inspiration. Art Director Douglas Rogers visited a magnolia plantation in Charleston, S…

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In many places, the film references classic movies, predominantly those by Disney. When Tinker Bell falls on Donkey and he says "I can fly" and people around including the Three Little Pigs say "He can fly, he can fly"; this is a reference to Disney's Peter Pan. Donkey then says, while still flying, "You might have seen a house fly, maybe even a super fly, but I bet you ain't never seen a Donkey fly!". This scene is a reference to the Disney film Dumbo. The scene where Fiona is singing to the blue bird is a reference to Snow White and the Seven Dwarfs. The transformation scene at the end of the film references Disney's Beauty and the Beast.

When Shrek crosses the bridge to the Castle and says, "That'll do, Donkey, that'll do", this is a reference to the movie Babe. The scene where Princess Fiona is fighting the Merry Men is a lengthy reference to the film The Matrix. At the end of the film, the Gingerbread Man, with a crutch and one leg, says "God bless us, everyone", which is a reference to Tiny Tim in A Christmas Carol.

In the scene where the Magic Mirror gives Lord Farquaad the option to marry three princesses, it parodies popular American television show The Dating Game featuring: Cinderella and Snow White. In addition, Lord Farquaad's theme park style kingdom Duloc heavily mimics Disneyland, even in so far as parodying the famous "It's a Small World" musical ride in the scene with the singing puppets. It has been suggested that Lord Farquaad himself is an unflattering parody of then-Disney CEO Michael Eisner, whom producer Katzenberg reportedly dislikes.