Yasu (夜須町 Yasu-machi) was a town located in Asakura District, Fukuoka, Japan.
On March 22, 2005 Yasu was merged with the town of Miwa, also from Asakura District, to form the new town of Chikuzen.
As of 2003, the town has an estimated population of 16,568 and a density of 364.37 persons per km². The total area is 45.47 km².