Death Note (デスノート, Desu Nōto) is a 2006 Japanese supernatural thriller film directed by Shusuke Kaneko. It is based on the manga series of the same title by Tsugumi Ohba and Takeshi Obata. The film primarily centers on a Tokyo college student who attempts to change the world into a utopian society without crime, by committing a worldwide massacre of criminals and people whom he deems morally unworthy of life, through a supernatural notebook that kills anyone whose name is written in its pages, while being hunted down by an elite task force of law enforcement officers within Tokyo, led by an enigmatic international detective.

It was followed by a sequel, Death Note 2: The Last Name, released in the same year. A spin-off film directed by Hideo Nakata and titled L: Change the World, was released on February 9, 2008. Another sequel, Death Note: Light Up the New World, was released in October 2016.

Light Yagami is an extremely intelligent university student who resents crime and corruption in the world. His life undergoes a drastic change when he discovers a mysterious notebook, known as the "Death Note", lying on the ground. The Death Note's instructions claim that if a human's name is written within it, that person shall die. Light is initially skeptical of the notebook's authenticity, but after experimenting with it, Light realizes that the Death Note is real. After meeting with the previous owner of the Death Note, a Shinigami named Ryuk, Light seeks to become "the God of the New World" by passing his judgment on those he deems to be evil or who get in his way.

Soon, the number of inexplicable deaths of reported criminals catches the attention of Interpol, as well as a mysterious detective known only as "L". L quickly deduces that the murderer, dubbed by the public as Kira (a Japanese approximation of the English word "killer"), is located in Japan. L also concludes that Kira can kill people without laying a finger on them. Light realizes that L will be his greatest nemesis, and a game of psychological "cat and mouse" between the two begins.

Light, pursued by L and by FBI detective Raye Iwamatsu, outsmarts them, killing Raye and his partners in the process. When Raye's fiancée, a former FBI detective named Naomi Misora, kidnaps Light's girlfriend Shiori Akino, Light pleads for her safety. Naomi accidentally shoots Shiori before taking her own life as the police approach. Light acts sorrowful for his girlfriend's death and asks to join the Kira investigation to get revenge, but he reveals to Ryuk that in fact he had learned Naomi's name beforehand and engineered the deaths of both Naomi and Shiori. The end of the film features Misa Amane, who survives an attempt on her life as her would-be assailant has a mysterious heart attack.

In his production notes, director Shusuke Kaneko explained his desire to convince audiences that, while the killing of bad humans may seem to be fair, it underestimates the corrupting influence of wielding such power (the manga series follows a very similar viewpoint). Kaneko also commented that the psychological fear of dying could be "more nightmarish than Kaiju (monsters) destroying cities and killing people".

Kaneko also stated that he wanted the film to "focus on psychological pain", explain how the deaths occur, and explain how younger people would begin to like Kira. He also removed many of the interior monologues prominent in the manga and anime to allow audiences to develop their own ideas about the characters' thoughts and beliefs, while allowing "dramatic tension".

Kaneko said that the most difficult portion of the manga to film was the scene when the investigation begins and the authorities conclude that a person is responsible for the killing of criminals. He chose to add a scene in which L explains his logic via his laptop in order to make the film "more believable" and "excite people" for the coming struggle between L and Light.