Yán Kějūn 嚴可均 (1762–1843), courtesy name Jǐngwén 景文, sobriquet Tiěqiáo 鐵橋, was a Qing-dynasty philologist and bibliographer from Wūchéng 烏程 (modern Húzhōu 湖州, Zhèjiāng). He was a jǔrén (1798) but never achieved the jìnshì degree and spent most of his life as a private scholar supported by wealthy patrons.
Yán is best remembered as the compiler of the monumental Quán shànggǔ sāndài Qín Hàn Sānguó Liùcháo wén 全上古三代秦漢三國六朝文 (KR4h0172–KR4h0182, KR4h0176, KR4h0178, KR4h0179), the most comprehensive anthology of pre-Tang prose ever assembled, spanning 746 juàn and covering 3,497 writers. He was pointedly excluded from the imperially-sponsored Quán Táng wén 全唐文 project (completed 1814) and responded by embarking on this far larger independent undertaking, working from 1808 until its completion in 1836, seven years before his death. The work was first printed posthumously by the Guǎngyǎ Shūjú 廣雅書局 (Guǎngdōng Provincial Press) in 1887–93 and reprinted by Zhōnghuá Shūjú in 1958 (4 vols.). A newly punctuated Héběi Jiàoyù edition in 10 volumes appeared in 1997.
Beyond this anthology, Yán compiled Shèng sòng wénjiàn lù 聖宋文鑑 and worked extensively on phonology and bronze-inscription studies. Qián Zhōngshū 錢鐘書 (1910–98) devoted 277 entries in his Guǎnzhuībiān 管錐編 (1979) to discussing and correcting Yán’s anthology.