Zhèng Yùtán 鄭玉壇 (hào Tóngyuán zhǔrén 彤園主人, fl. late Jiāqìng / early Dàoguāng, early 19th c. 清), mid-Qīng physician. Author of the Tóngyuán yīshū 彤園醫書, a comprehensive medical compendium issued under the Tóngyuán (Vermillion-Garden) studio imprint; the gynecology section is KR3ei037 Tóngyuán yīshū·Fùrénkē. The compilation is in the standard mid-Qīng zhézhōng 折衷 (compromise-synthesis) tradition, drawing on the major late-imperial gynecological authorities. No further biographical detail located.