Lǐ Jiǎnyì 李簡易 (hào Yùxī zǐ 玉谿子) was a thirteenth-century nèidān 內丹 master of Yíchūn 宜春 in Jiāngxī, fl. 1264, associated in later classification with the Quánzhēn 全真 order. He was the grandson of Lǐ Guān 李觀 (hào Yùxī sǒu 玉谿叟), a literati-Daoist official whose encounters with Liú Hǎichán 劉海蟾 at Yuèshān and at the Yuèyáng Tower are narrated in his grandson’s preface to the Yùxī zǐ dānjīng zhǐyào (KR5a0246 / DZ 245; see KR5a0246). Lǐ Jiǎnyì took his training in Daoist and Buddhist classics alongside medicine, astrology, and divination, but concentrated on the jīndān 金丹 (“Golden Elixir”) transmission; he received instruction at the Guìxiānfāng 桂仙坊 Wángzǐ miào 王子廟 and at Jiānglíng 江陵 府. His surviving works all sit in KR5a0246; Yú Yǎn 俞琰 (1258–1314) refers to a Chángshā printing of his collected writings ca. 1281 (suppressed with the general Qubilai-era book-burning order) and to a later Jiāngxī reprint by Péng Shí 彭時 and Pò Jiànmíng 婆劍明. The 1354 Wáng Guì 王珪 edition, Shíshū 十書, is the basis of the extant Dàozàng text. No CBDB record located.