Dīng Gānrén 丁甘仁 (míng Zézhōu 澤周, zì Gānrén; original name Zhònggāng 仲剛, 1865–1926) was the founder of the Mènghé 孟河 school of medicine in modern Shanghai and one of the most influential clinicians of the late-Qīng/early-Republican transition. Native of Wújìn 武進 (Chángzhōu prefecture, Jiāngsū), he studied under Wū Xiūshēng 巫秀生 and his elder brother Dīng Zǐliáng 丁子良, both of whom were heirs of the Mènghé physicians Mǎ Péizhī 馬培之 馬培之 and Fèi Bóxióng 費伯雄 費伯雄. He moved to Shanghai c. 1887 and built a major practice, then in 1916 co-founded the Shanghai Chinese Medicine Professional School (上海中醫專門學校) — the first formal academic-degree-granting institution for Chinese medicine — together with Xiè Lìhéng 謝利恆 and Xià Yìngtáng 夏應堂. The school trained the generation of Chinese-medicine educators (Chéng Ménxuě 程門雪, Huáng Wéndōng 黃文東, Qín Bówèi 秦伯未, and others) who would dominate Chinese medical pedagogy from the 1930s through the post-1949 institutionalization. His extensive case records and family formulary — Dīng Gānrén xiānshēng jiāchuán zhēnfāng 丁甘仁先生家傳珍方 KR3ed061, Dīng Gānrén yīàn 丁甘仁醫案 — are major sources for the clinical synthesis of warm-disease, jīngfāng, and post-Sòng formularies that characterised the Mènghé tradition.