Chén Nán 陳楠 (d. 1213), styled Cuì xū zhēn rén 翠虛真人 and Ní wán wēng 泥丸翁, was the fourth patriarch of the Southern Lineage (Nán zōng 南宗) of Daoist inner alchemy, disciple of Xuē Dàoguāng and teacher of 白玉蟾 Bái Yùchán. Noted both as a nèi dān transmitter and as a ritual-thunder specialist. Author of KR5d0113 Cuì xū piān 翠虛篇.