Yaku, Kagoshima

 was a town located on the southern half of Yakushima (Yaku Island) in Kumage District, Kagoshima Prefecture, Japan.
As of 2003, the town had an estimated population of 7,008 and a population density of 28.96 persons per km². The total area was 242.03 km².
On October 1, 2007, Yaku, along with the town of Kamiyaku (also from Kumage District), was merged to create the town of Yakushima.