The Petrov Case (in Japanese: ペトロフ事件) is a mystery fiction by a Japanese novelist, Tetsuya Ayukawa. It is about a rich Russian émigré's death in Dalian, when it was Japan's leased territory, that Detective Onizuka of Dalian Police tries to solve by finding the suspects' false alibis.
Written in 1950, it won Ayukawa a Naoki Prize. He wrote this story against a Dalian background, which, after five years, he still had in his fresh memory.