Fatal Frame II: Crimson Butterfly, known in Japan as Zero ~Akai Chou~ (Zero ~Crimson Butterfly~) and in Europe as Project Zero II: Crimson Butterfly, is a Japanese survival horror game and the second installment in the Fatal Frame series.

The game resumes the characteristic use of a camera to fend off ghosts, only this time without the claim of being "Based on a true story". Despite this, Fatal Frame II is arguably the most known of the Fatal Frame series, due to its engaging story, refined use of the camera and abundant scares.