Duan Yucai (1735–1815), courtesy name Ruoying (若膺) was a Chinese philologist of the Qing Dynasty. He made great contributions to the study of Historical Chinese phonology, and is known for his annotated edition of Shuowen Jiezi.
- Occupation
- linguist, philosopher, politician, philologist
- Position held
- county magistrate
- Citizenship
- Qing dynasty
- Born
- 1735
- Died
- 1815, October 10, 1815
