Hideo Yokoyama (born 1957) is a Japanese novelist from Tokyo. After graduating from the International University of Commerce, now Tokyo International University, he spent twelve years as a reporter for the Jomo Shimbun before becoming a freelance writer. He made his literary debut after winning the Matsumoto Seicho Prize for "Kage no Kisetsu" in 1998. His fiction often focuses on people working within institutions such as the police and newspapers, exploring professional pride, internal rivalries, and the difficult choices individuals make under organizational pressure. His major novel "64 (Rokuyon)" follows Yoshinobu Mikami, a former detective serving as a police press director, as he is caught between rival divisions of the D Prefectural Police and an increasingly hostile press corps. At the center of the conflict is an unsolved kidnapping and murder committed during the seven days of the Showa 64 era, and Mikami’s investigation gradually brings him closer to a secret the police organization has concealed for fourteen years.
