The episode "Itchy & Scratchy Land", in which the titular park's robots go haywire, is partly based on the film.
In "The Boy Who Knew Too Much", Principal Skinner's pursuit of a truant Bart parodies the film, especially the scene of him unflinchingly walking through a river.
In "Treehouse of Horror XXIX", co-executive producer Jeff Westbrook is credited as "Jeff Westworld".
In "Krusty the Clown", a TV executive reveals to Homer that all television is fake and presents the titles of shows that don't really exist, including Westworld.
The third segment of "Treehouse of Horror XXXIII" is a parody of the HBO series called Simpsonsworld, where tourists get to interact with iconic moments from the show. At the end, it revealed that there are similar parks based on other popular cartoons.