A Scanner Darkly is a 2006 American adult animated science fiction thriller film written and directed by Richard Linklater; it is based on the 1977 novel by Philip K. Dick. The film tells the story of identity and deception in a near-future dystopia constantly under intrusive high-tech police surveillance in the midst of a drug addiction epidemic.

The film was shot digitally and then animated using interpolated rotoscope, an animation technique in which animators trace over the original footage frame by frame, for use in live-action and animated films, giving the finished result a distinctive animated look. Principal photography began on May 17, 2004, and lasted six weeks.

The film features performances by Keanu Reeves, Robert Downey Jr., Woody Harrelson, and Winona Ryder. Steven Soderbergh and George Clooney are among the executive producers. A Scanner Darkly had a limited release on July 7, 2006, and a wider release on July 28, 2006 by Warner Independent Pictures. The film was screened at the 2006 Cannes Film Festival and the 2006 Seattle International Film Festival, and was a finalist for the Hugo Award for Best Dramatic Presentation, Long Form in 2007. The film received generally positive reviews, with praise for its performances and animation, but performed poorly at the box office.