Shrek the Third is a 2007 American animated fantasy comedy film loosely based on the 1990 children's picture book Shrek! by William Steig. Directed by Chris Miller and co-directed by Raman Hui from a screenplay by Jeffrey Price, Peter S. Seaman, Miller, and producer Aron Warner, and a story conceived by Andrew Adamson, co-director of the previous two installments, it is the sequel to Shrek 2 (2004) and is the third installment in the Shrek film series. The film features Mike Myers, Eddie Murphy, Cameron Diaz, Antonio Banderas, Rupert Everett, Julie Andrews, and John Cleese reprising their voice roles from the previous films, along with new additions Justin Timberlake as Arthur Pendragon and Eric Idle as Merlin. In the film, Prince Charming is plotting to overthrow Shrek and Fiona, who have inherited the throne following King Harold's death. Shrek has no interest in ruling the kingdom and attempts to convince Fiona's underachieving 16-year-old cousin Artie to reign instead.

Shrek! is a fantasy comedy picture book published in 1990. Written and illustrated by American book writer and cartoonist William Steig, it is about a repugnant green monster who leaves home to see the world and ends up marrying an ugly princess. The book was generally well received upon publication, with critics praising the illustrations, originality, and writing. Critics have also described Shrek as an antihero and noted the book's themes of satisfaction and self-esteem. The book served as the basis for the first Shrek film.