Huán Fàn 桓範 (?–249), zì Yuánzé 元則, was a senior CáoWèi 曹魏 statesman and zǐ-house writer, a native of Pèiguó 沛國 Lóngkāng 龍亢 (modern Ānhuī). His biography is preserved as an appendix to Cáo Shuǎng’s 曹爽 biography in Sānguó zhì 三國志 j. 9, with substantial detail in Péi Sōngzhī’s 裴松之 zhù. His birth year is not recorded; the death year 249 is firmly attested — he was executed in the Sīmǎ Yì 司馬懿 coup of that year (the Gāopínglíng zhī biàn 高平陵之變), along with Cáo Shuǎng and the rest of the Cáo regent’s faction.
He rose through the Wèi bureaucracy to Shàngshū 尚書, Sǎnqí chángshì 散騎常侍, and Dàhónglú 大鴻臚 (Grand Master of Splendid Happiness), and was reckoned by Cáo Shuǎng as one of the “wise hawks” (智囊) of the regent’s circle. His attempt to persuade Cáo Shuǎng to resist Sīmǎ Yì by relocating the young Wèi emperor to Xǔchāng — preserved in detail by Péi Sōngzhī — is one of the most celebrated political tableaux of the WèiJìn transition. After Cáo Shuǎng yielded, Huán Fàn was condemned to be executed with the regent’s faction, the so-called sān zú 三族 punishment falling on his clan.
He is principally remembered today for his Shìyào lùn 世要論 — a substantial zǐ-house political treatise in 12 juàn (per the Suí shū jīngjí zhì) — extant only as a Qing-era jíyì. In the Kanripo corpus he is the attributed author of KR3a0142 Shìyào lùn. CBDB has no entry.