Seishū Hase (1965–) is a Japanese novelist best known for his hard-boiled and noir fiction. His work frequently explores crime, violence, loneliness, and loss through fast-paced narratives and psychologically complex characters. He made his literary debut in 1996 with "Fuyajō" ("Sleepless City"), which established him as a leading voice in Japanese crime fiction, and has received numerous literary awards, including the Japan Mystery Writers Award. In 2020, he won the 163rd Naoki Prize for "Shōnen to Inu" ("The Boy and the Dog"), a novel in which a single dog journeys across post-earthquake Japan, bringing together people struggling with grief, redemption, and hope.