Kyotaro Nishimura (?? ???, Nishimura Kyotaro, pseudonym of Kihachiro Yajima, born 6 September 1930 in Tokyo, Japan) is a Japanese novelist of Police procedural.
Nishimura is best known for his "train series" mysteries, most of which feature his characters, police detectives Shozo Totsugawa, Sadao Kamei and Tokitaka Honda.
He won the Mystery Writers of Japan Award in 1981 for The Terminal Murder Case.
Spouse is Mizue Yajima.