Ding Yan (丁晏; 1794–1875) was a Qing dynasty Chinese classical scholar. He achieved the rank of juren in the Imperial Examinations.

Ding was born in Shanyang (present-day Huai'an), Jiangsu province. Although not awarded an official post, he was an important figure in the defense of Shanyang from the British in 1842, during the First Opium War. He also helped to rebuild the city's walls after the attack. As a result, he was appointed secretary of the Grand Secretariat in 1843.

The following decade, Ding again organised a militia to defend the city from the Taipeng Rebellion. However, he was accused of incompetence, and was banished. This ruling was later overturned, and he was given responsibility for civilian military training, eventually reaching the second rank. His sons Shou-ch'ang and Shou-ch'i also served in public office.

Despite his military accomplishments, Ding was best known as a scholar of the Classics. His Shang shu yu lun made the case for the forgery of the Shu ching, and he made many key arguments in favour of Wu Cheng'en being the original author of the Buddhist classic Journey to the West. He authored over fifty books on scholarly subjects, and was the director of two literary academies. Many of his works were compiled and published in 1862 as the Yi zhi zhai cong shu (Collected works of Yizhizhai Studio).

丁晏（1794年 - 1875年），字儉卿，號柘堂，江蘇山陽縣人。

八世祖丁國信，原籍山東濟南。乾隆五十九年（1794年），生于淮安城裡大溝巷本宅，六歲啟蒙，嗜讀書，朱湘很看重他，將女兒嫁他。十七歲結識潘德輿。漕督阮元督察郡學，以「漢易十五家發策」質學子，丁晏「草萬餘言上之，分條析派，博而有要」，阮元十分讚賞。汪廷珍稱讚丁晏「氣平心細，識見明確，當今豪傑之士也。」道光元年舉人，後由「舉人大挑得教諭，不謁選」。官至內閣中書。晚年主講于麗正書院。咸豐十年（1860年），因平定捻軍有功，晏端上書保薦，賞戴花翎。同治三年（1864年），漕督吳元炳又奏保「賞二品封典，誥授通奉大夫」。十年與何紹基主持《重修山陽縣誌》、《淮安藝文志》修纂。光緒元年（1875年），病逝，墓葬淮安石壙呂莊。著有《尚書餘論》2卷、《石亭紀事續編》2卷。編有《頤志齋叢書》二十二種。又刊刻駱騰鳳的數學著作《藝游錄》，「遺稿凡十餘萬言，俱手自繕寫」。

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