Nankin is an unincorporated community and Census-designated place in southern Orange Township, Ashland County, Ohio, United States. As of the 2020 census, Nankin had a population of 435. It has a post office with the ZIP code 44848. It lies at the intersection of State Routes 58 and 302 and is near U.S. 250.
Nankin was originally called Orange, and under the latter name was laid out in 1828. A post office called Nankin has been in operation since 1833.