Japanese noblewoman and waka poet
Kojijū (小侍従; 1121–1202 CE) (also Matsuyoi no Kojijū) was a "waka" poet and Japanese noblewoman active in the late Heian period. 
Her father was Ki no Mitsukiyo, and her mother was the poet Hanazono Sadaijinke no Kodaishin.
As a lady-in-waiting, she served the twice-empress Fujiwara no Tashi (who was wife, successively, to Emperor Konoe and Emperor Nijō), as well as in the court of the retired Emperor Takakura. Additionally, she took part in poetry contests organized by Emperor Go-Toba. During this time, courtiers were expected to be skilled poets, and a great deal of court life involved composing and exchanging poetry, as well as participating in poetry contests. Kojijū is designated a member of the . She left a private collection of poems titled the "Kojijū-shū".
Contemporaries noted her for her especial skill in composing poems that exactly suited the situation, particularly when writing a verse as a response to someone else's verse.
In 1179, she became a Buddhist nun.
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