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Zhang Zun 張臶 (136-240), courtesy name Ziming 子明, was a scholar and hermit during the early Three Kingdoms period 三國 (220-280).
He came from Julu 巨鹿 (modern Ningjin 寧晉, Hebei), but during his younger years visited the National University (taixue 太學). He was invited by the warlords Yuan Shao 袁紹 and Cao Cao 曹操 for service, later also by Emperor Ming 魏明帝 (r. 226－239 CE), but Zhang declined.
Later on he withdrew to the Changshan 常山 mountain range, where he lived as a Daoist practitioner. Some sources say he died in the age of 105 sui.