Knox Goes Away (known in some markets as A Killer's Memory or Assassin's Plan) is a 2023 American crime thriller film directed by Michael Keaton and written by Gregory Poirier. It stars Keaton (who also co-produced) in the title role, with James Marsden, Suzy Nakamura, Joanna Kulig, Ray McKinnon, John Hoogenakker, Lela Loren, Marcia Gay Harden, and Al Pacino in supporting roles. It follows a contract killer with a rapidly evolving form of dementia, who vows to spend his final days attempting to redeem himself by saving the life of his estranged adult son.

The film had its world premiere at the 48th Toronto International Film Festival on September 10, 2023, and was theatrically released in the United States on March 15, 2024, by Saban Films. It received mixed reviews from critics.