(500) Days of Summer is a 2009 American romantic comedy film directed by Marc Webb, written by Scott Neustadter and Michael H. Weber, and produced by Mark Waters. The film stars Joseph Gordon-Levitt and Zooey Deschanel and employs a nonlinear narrative structure, with the story based upon its male protagonist and his memories of a failed relationship.

Romantic comedy is a subgenre of comedy and romance fiction, focusing on lighthearted, humorous plot lines centered on romantic ideas, such as how true love is able to surmount most obstacles. In a typical romantic comedy, the two lovers tend to be young, likeable, and seemingly meant for each other, yet they are kept apart by some complicating circumstance until, surmounting all obstacles, they are finally united. A fairy-tale-style happy ending is a typical feature.