Onmyōji (陰陽師) is a series of historical fantasy short stories and novels written by Japanese author Baku Yumemakura.

It follows the story of a fictionalized version of the Heian period onmyōji Abe no Seimei, a master in onmyōdō, a traditional Japanese form of cosmology.

The original stories and novels have also inspired several live-action adaptions: a Japanese television drama series was broadcast on NHK G in 2001; two films directed by Yojiro Takita were released in 2001 and 2003; two TV movies were broadcast on TV Asahi in 2015 and 2020; a Chinese live-action film directed by Guo Jingming was released in 2020.

Written by Baku Yumemakura, the original "Onmyōji" short story first appeared in the Bungeishunju's All Yomimono in the September 1986 issue.

[61] A sequel manga series, also written by Okano, titled Onmyōji: Tamatebako (陰陽師 玉手匣), was announced on October 28, 2010,[62] and was serialized in Melody from December 28, 2010, to April 28, 2017.

[66][65] A manga adaptation of Onmyōji: Taki Yasha Hime written by Munku Mitsuki was serialized in Tokuma Shoten's magazine Monthly Comic Ryū between March 19, 2012, and December 20, 2015.

The series is directed by Soubi Yamamoto and produced by Marvy Jack, with scripts written by Natsu Hashimoto and Yuiko Kato.