Hideo Yokoyama (?? ??, Yokoyama Hideo, born 1957) is a Japanese novelist.
Yokoyama specializes in mystery novels.
He repeated his Kono Mystery ga Sugoi! No.
1 ranking in 2013 with Six Four (64).
The English edition of Six Four, translated by Jonathan Lloyd-Davies, was shortlisted for the 2016 CWA International Dagger.He is known for his career as journalist for the Jomo Shimbun, the regional paper in Gunma.