is a Japanese professional baseball pitcher for the Hokkaido Nippon-Ham Fighters of Nippon Professional Baseball (NPB).
On June 19, 2025, Kitayama pitched a no-hitter until the bottom of the 9th inning, when he allowed a solo home run to Yomiuri Giants catcher Takumi Ohshiro. He was named an NPB All-Star for the first time in 2025.