Yaku (屋久町 Yaku-chō) was a town located on the southern half of Yakushima (Yaku Island) in Kumage District, Kagoshima, Japan.
On October 1, 2007 Yaku was merged with the town of Kamiyaku, also from Kumage District, to form the new town of Yakushima.
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.