Naoyuki Uchida (内田 直行, Uchida Naoyuki, born December 23, 1960), who writes under his pen name Yukito Ayatsuji (綾辻 行人, Ayatsuji Yukito), is a Japanese writer of mystery and horror.

He is one of the founders of Honkaku Mystery Writers Club of Japan and one of the representative writers of the new traditionalist movement in Japanese mystery writing.

[3] His first novel The Decagon House Murders was ranked as the No.

[4] In 2018, a minor planet (2001 RG46) was named as Yukito Ayatsuji.

[10] A series of 28 short stories published from 2004 to 2016, which were collected in 3 volumes.