Xuē Dàoguāng 薛道光 (trad. 1078–1191), zì Dàoyuán 道源, styled Zǐ xián zhēn rén 紫賢真人, was the third patriarch of the Southern Lineage (Nán zōng 南宗) of Daoist inner alchemy — successor to Shí Tài 石泰 (who received the transmission from Zhāng Bóduān). Originally a Buddhist monk before Shí Tài converted him to the Daoist nèi dān path. Author of KR5d0111 Huán dān fù mìng piān 還丹復命篇 (preface 1126).