Mumyōzōshi (無名草子, literally "nameless book") is an early 13th-century Japanese text.
One volume in length, it is the oldest existing Japanese text on prose literary criticism.
[1] The author is unknown, but the leading candidate proposed is Shunzei's Daughter.
[2] Other candidates who have been proposed include her maternal grandfather Shunzei himself and the monk Jōgaku (上覚).
[3] One manuscript gives the title as Kenkyū Monogatari (建久物語),[1] a reference to the name of the era in which it was written.