Seishi Yokomizo (横溝 正史) was a novelist in Shōwa period Japan.
Yokomizo was born in the city of Kobe, Hyōgo (兵庫県 神戸市). He read detective stories as a boy and in 1921, while employed by the Daiichi Bank, published his first story in the popular magazine "Shin Seinen" (新青年[New Youth]). He graduated from Osaka Pharmaceutical College (currently part of Osaka University) with a degree in pharmacy, and initially intended to take over his family's drug store even though sceptical of the contemporary ahistorical attitude towards drugs. However, drawn by his interest in literature, and the encouragement of Edogawa Rampo (江戸川 乱歩), he went to Tokyo instead, where he was hired by the Hakubunkan publishing company in 1926. After serving as editor in chief of several magazines, he resigned in 1932 to devote himself full-time to writing.
سيشي يوكوميزو (اليابانية: 横溝 正史، هيبورن: Yokomizo Seishi، ولد في 24 مايو 1902 - توفى في 28 ديسمبر 1981) كان كاتب ياباني لروايات الغموض، معروفًا بإنشاءه لشخصية المحقق كوسوكي كيندايشي.
