The kana preface to the Kokin Wakashū (古今和歌集仮名序 Kokin Wakashū kana-jo, 古今集仮名序 Kokinshū kana-jo, or simply 仮名序 kana-jo; rekishi-teki kanazukai: 假名序) is one of the two prefaces to the tenth-century Japanese waka anthology, the Kokin Wakashū. It was written by the poet/editor Ki no Tsurayuki. It is also known in English as the Japanese preface, distinguishing it from Ki no Yoshimochi's Chinese preface (mana-jo). It was the first serious work of poetic criticism on the waka style, and is regarded as the predecessor of later karon works.