Seicho Matsumoto (松本 清張, Matsumoto Seichō), December 21, 1909 – August 4, 1992) was a Japanese writer.
Matsumoto's works created a new tradition of Japanese crime fiction. Dispensing with formulaic plot devices such as puzzles, Matsumoto incorporated elements of human psychology and ordinary life into his crime fiction. In particular, his works often reflect a wider social context and postwar nihilism that expanded the scope and further darkened the atmosphere of the genre. His exposé of corruption among police officials as well as criminals was a new addition to the field. The subject of investigation was not just the crime but also the society in which the crime was committed.