Dr. Seuss' The Cat in the Hat is a 2003 live-action film, based on the 1957 book, produced by Universal Studios, DreamWorks Pictures, and Imagine Entertainment. It was produced by Brian Grazer and directed by Bo Welch; it starred Mike Myers in the title role of the Cat in the Hat, and Dakota Fanning as Sally. Sally's brother, who is not named in the book, is known in this version as "Conrad" and played by Spencer Breslin.

While the basic plot of the live-action adaptation of The Cat in the Hat rotates around that of the book, the film filled out its 82 minutes by adding new subplots and characters quite different from those of the original story.