Demonlover is a 2002 technological neo-noir thriller film by French writer/director Olivier Assayas. The film stars Connie Nielsen, Charles Berling, Chloë Sevigny, and Gina Gershon with a musical score by Sonic Youth. It premiered at the 2002 Cannes Film Festival, although it was more widely released several months later. Reviews were decidedly mixed: the website Rotten Tomatoes gives the film a 49% rating.

The story focuses on the entanglement between various national corporations vying over the financial control of interactive 3-D anime pornography. The film contains various themes, including desensitization to violence and the problematic nature of globalization. The film defies most genre categories, but is most often labeled a drama with hints of espionage and corporate crime reminiscent in noir thrillers. Upon its theatrical release in the United States, it was rated R for strong violence, sexual content and some language. It was released in both R-rated and unrated director's cut versions on DVD.

The film is primarily in the French language with some scenes in English and some in Japanese. It has been considered an example of New French Extremity by some journalists. In recent years the film has gained a cult following for its post-modern aesthetics and soundtrack by American rock group, Sonic Youth.