was a Japanese poet of both waka and kanshi (Japanese and Chinese poetry, respectively). He also composed the Chinese preface (mana-jo) to the tenth-century waka anthology, the Kokin Wakashū. He studied classics at the Imperial University, before serving various, mostly scholarly, positions at court.
The date of birth of Ki no Yoshimochi is unknown. He was the first-born son of and the elder brother of and, and may have been the adopted son of Ki no Tsurayuki.
In Kanpyō 8 (896) he entered the Imperial University as a . In 906 (Engi 6), he attained the Junior Fifth Rank, Lower Grade, and in 912 was promoted to the Junior Fifth Rank, Upper Grade, having acted as and . In 913 he became .
He died in 919, Engi 19.
The, Kokin Wakashū and Shinkokin Wakashū each include one waka (poem in Japanese) attributed to him, but it seems his Chinese writings were held in higher regard, as the Wakan rōeishū leads one of its books with a kanshi (Chinese poem) by him and he was selected to write the Chinese preface to the Kokin Wakashū (see below).
He wrote the Chinese preface (mana-jo) to the Kokin Wakashū, in which he expressed the view that all poetry has its source in human emotion. This view was popular in China (including in his major source for his preface, the major preface to the Shi Jing) and Japan, and reflects an east Asian attitude to poetry not shared in other parts of the world where major poetry was frequently inspired by battles, heroes, gods and the communication of moral truths. The preface dates itself to the fourth month of 905.