, also known was, was a Japanese poet and monk of the late Heian period.
Along with Izumi Shikibu, Nōin is one of "Thirty-six Medieval Poetry Immortals" of waka poetry selected by (1107–1165).
Nōin authored of the Gengenshu and Nōin Utamakura.
One of his poems is anthologized in the Ogura Hyakunin Isshu: