Shin Kamen Rider (シン・仮面ライダー, Shin Kamen Raidā) is a 2023 Japanese superhero film directed and written by Hideaki Anno. Produced to celebrate the 50th anniversary of Kamen Rider, it is Anno's third reimagining of a tokusatsu series, following Shin Godzilla (2016) and Shin Ultraman (2022), and the first without his frequent collaborator Shinji Higuchi. The film stars Sosuke Ikematsu, Minami Hamabe, Tasuku Emoto, Nanase Nishino, Shinya Tsukamoto, Toru Tezuka, Suzuki Matsuo, and Mirai Moriyama. In the film, a man and his female cohort attempt to annihilate the illegal organization responsible for his conversion into a mutant cyborg and stop their plans to conquer society.

Anno first proposed the project after becoming close with Toei producer Muneyuki Kii during the production of Evangelion: 3.0 You Can (Not) Redo (2012). Toei initially aimed for the film to be released in 2021, however, the COVID-19 pandemic delayed its production. Principal photography began on October 3, 2021, and wrapped at the end of January 2022.

Shin Kamen Rider premiered in selected Japanese theaters on March 17, 2023, and was released nationwide the next day, by Toei. The film received mostly positive reviews from critics and grossed $16.02 million, making it the most commercially successful Kamen Rider film. Fathom Events later released it in the United States on May 31, 2023. It began streaming on Amazon Prime Video in over 200 locations worldwide on July 21, 2023, as Shin Masked Rider. Hamabe won Best Supporting Actress at the 66th Blue Ribbon Awards for her performances in the film and the kaiju epic Godzilla Minus One, and she was also nominated for Best Supporting Actress at the 47th Japan Academy Film Prize.