Rèn Chénjìn 任陳晉, zì Sìwǔ 似武, hào Hòushān 後山 (also Yǐzhāi 以齋), was a Qiánlóng-period Confucian scholar from Xīnghuà 興化 (Yangzhou prefecture, Jiāngsū 江蘇). He passed the jìnshì in Qiánlóng jǐwèi 乾隆己未 = 1739 and held office as Education Director (jiào shòu 教授) of Huīzhōu 徽州.
His one work in the Sìkù is the Yì xiàng dà yì cún jiě 易象大意存解 (KR1a0158) — a single-juàn methodological Yìjīng essay-collection. The work programmatically takes xiàng 象 (symbol) as the principal interpretive frame, citing the Zuǒ zhuàn episode of Hán Qǐ 韓起 visiting Lǔ to view “the Yì xiàng and the Chūnqiū” as evidence that the canonical name and method of the Yì is symbol-based. He combines selective acceptance of the Hé túLuò shū / xiāntiān chart-tradition with rejection of technical-numerology and chart-piling — methodologically a moderate position between Lǐ Guāngdì school and the Wú pài Hànxué school.