Nankō (南光町 Nankō-chō?) was a town located in Sayō District, Hyōgo Prefecture, Japan.
As of 2003, the town had an estimated population of 4,432 and a density of 88.89 persons per km². The total area was 49.86 km².
On October 1, 2005, Nankō, along with the towns of Kōzuki and Mikazuki (all from Sayō District), was merged into the expanded town of Sayō.