Zheng Xuan (127–200), courtesy name Kangcheng (康成), was a Chinese philosopher, politician, and writer near the end of the Han Dynasty. He was born in Gaomi, Beihai Commandery (modern Weifang, Shandong), and was a student of Ma Rong.

Like his teacher, he was a member of the Old Text School that was challenging the state orthodox New Text School. His contemporary rival was He Xiu (, 129-182). Zheng is notable for his syncretic attempt to bridge the two centuries of rivalry between the two schools. He adopted the strengths of each school in the interpretation of the Confucian classics although he usually favored the Old Text teachings. He was very influential but the government never officially adopted his teachings. The Han Dynasty was already in decline during his lifetime and collapsed a generation after his death. Both schools did not survive the chaos but Zheng's conception of Confucianism would be the mainstream interpretation for centuries.

In 200, during the Battle of Guandu, Zheng was ordered by the warlord Yuan Shao to Yuan's stronghold (in modern-day Daming County, Hebei Province), where he died of illness in June.

The commemorative shrine of Zheng Xuan in Shandong was rebuilt under supervision of Ruan Yuan 阮元 (1764–1849) in 1793.

Read more...: In Romance of the Three Kingdoms  

鄭玄（127年 - 200年），字康成，北海高密（今山東省高密市）人，東漢經學家、預言家。集兩漢經學小成。曾拜大司農。《拾遺記》稱鄭玄為「經神」。

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