was a town located in Shimoge District, Ōita Prefecture, Japan.
Population
In 2003, the village had an estimated population of 5,574 and the density of 121.12 persons per km<sup>2</sup>. The total area was 46.02 km<sup>2</sup>.
History
On March 1, 2005, Sankō, along with the towns of Hon'yabakei, Yabakei and Yamakuni (all from Shimoge District), was merged into the expanded city of Nakatsu.