Kōsai (幸西, 1163 – May 20, 1247) was a former monk of the Tendai Buddhist sect and controversial disciple of Hōnen who advocated the ichinen-gi (一念義, "Single recitation doctrine") that led to his public censure, his later expulsion by Hōnen and eventual exile to Shikoku.
Thus, he taught a path strictly based on faith without any Buddhist practice, which drew criticism from established Buddhist sects at the time, and even Hōnen's other disciples.
After Hōnen's primary patron, Kujō Kanezane complained in a letter to Hōnen expressing confusion, Hōnen censured Kōsai, and asked his other disciples to sign a seven-article pledge agreeing to adhere to wholesome Buddhist conduct, as well as not slandering other teachings.
Unrepentant, Kōsai, continued to teach his doctrine, and like other disciples, was exiled from Kyoto in 1207 during the Karoku Persecution.
Kōsai continued to teach the single-recitation method of Pure Land Buddhism in Shikoku, and gathered other followers before his sect was discredited and died out.