Yīn Jī 殷基 was a SūnWú 孫吳 official active in the mid-3rd century, son of Yīn Lǐ 殷禮 (a Lújiāng 廬江 commandery elder and trusted minister of Sūn Quán 孫權; the elder Yīn served as Inspector of Shàngshū 尚書 and later as governor of Línglíng 零陵). Yīn Jī’s own biography is not preserved separately; he is known only through Péi Sōngzhī’s 裴松之 commentary to the Sānguó zhì 三國志, where his Tōngyǔ 通語 is repeatedly cited as a source for the politics of Sūn Liàng’s 孫亮 reign and the Èrgōng zhī zhēng 二宮之爭 succession dispute. He held the post of Grand Master of Palace Leisure (郎中) under Sūn Liàng. CBDB has no entry for him.
In the Kanripo corpus he is the attributed author of KR3a0122 Tōngyǔ 通語.