Chain is a 2004 docufiction film written and directed by Jem Cohen. It follows two young women from opposite ends of the socioeconomic spectrum. One (Miho Nikaido) is a Japanese professional who has been sent by her corporation to inspect theme parks in the United States. The other (Mira Billotte) is a runaway who is squatting near a mall and works a series of dead-end jobs. The women never meet or communicate with each other, but by the end of the film, their viewpoints have become similar as their lives are both impacted by the homogenization of retail culture and infrastructure.

It has been described as a "narrative/documentary" hybrid, with Stephen Holden of The New York Times saying it "deliberately blurs the lines between fiction, documentary and cinematic essay."

Tamiko, a corporate executive from Japan, is sent to the United States by her company, which is looking to enter the theme park business with a venture potentially called "Floating World". Her assignment is to compile information on American theme parks and report the findings to her bosses. Amanda, a young homeless drifter, squats in an abandoned warehouse across the street from a mall. While working a series of short-term jobs, including as a concessions worker on a sightseeing boat and as a cleaning woman at a motel, she records a video diary that she intends to send to estranged family. Amanda and Tamiko's lives and differences are contrasted. Increasingly, both women are changed by the loss of regional identity due to the similarity of retail culture worldwide.

Jem Cohen said the original idea behind the film was to take structures that seemed out of place in a photograph, such as billboards or franchise restaurants, and put them front and center. He commented, "We’re so surrounded by malls and logos, big-box stores and all, but they seem to take on this weird invisibility...I shot them for years, using fine-grain 16 mm film to do it more clearly. A sort of archive of nothingness."

An influence on the film was the Barbara Ehrenreich book Nickel and Dimed, which investigates the difficulties faced by low-wage workers in America.

The fictional storyline of the two women was interwoven into the footage Cohen shot over several years at malls, hotels and office parks in Europe, the continental US, Japan, and Australia.

The filmed premiered at the 2004 Berlinale and in the United Kingdom on August 22, 2004 at the Edinburgh International Film Festival. In Belgium, it premiered on October 6, 2004 at the Flanders International Film Festival. In France, it premiered at the Belfont Entrevues Film Festival on November 30, 2004. Its American debut was at the Museum of Modern Art and festivals included the Independent Film Festival of Boston on April 23, 2005. The film was given a brief theatrical run at Manhattan's Independent Film Center.

On Rotten Tomatoes, Chain has an approval rating of 63% based on 8 reviews.