Yán Yúdūn 嚴虞惇 (1650–1713), zì Bǎochéng 寳成, was a Kāngxī-period official, classical scholar, and Shī jīng commentator. Native of Chángshú 常熟 (Sūzhōu 蘇州 prefecture, modern Jiāngsū 江蘇). Passed the jìnshì in Kāngxī 36 dīngchǒu (1697) and rose to Tàipúsì shǎoqīng 太僕寺少卿 (Vice-Director of the Court of the Imperial Stud).
His principal classical-canonical work is the Dú Shī zhì yí 讀詩質疑 (KR1c0059) — 31 juǎn with 15 juǎn of fù lù (appendices) — a comprehensive Shī commentary judiciously balancing xiǎo xù and Zhū Xī’s Jí zhuàn. The work was not printed in his lifetime; it was cut by his grandson Yán Yǒuxǐ 嚴有禧, the Húnán yìyándào 驛鹽道 (Posts and Salt Circuit Intendant), and presented to the throne in Qiánlóng 12 (1747).
CBDB id 76346 confirms lifedates 1650–1713.