Masakatsu Nishikawa (西川正勝, Nishikawa Masakatsu, January 14, 1956 – July 13, 2017) was a Japanese serial killer who killed four snack bar hostesses and attempted to kill two others from 1991 to 1992 in three prefectures. An ex-criminal with a murder conviction, he was convicted of his latter crimes, sentenced to death and executed in 2017.