Yayoi (弥生町 Yayoi-machi) was a town located in Minamiamabe District, Ōita, Japan.
On March 3, 2005 Yayoi, along with the towns of Kamae, Kamiura, Tsurumi and Ume, and the villages of Honjō, Naokawa and Yonōzu, all from Minamiamabe District, was merged into the expanded city of Saiki.
As of 2003, the town had an estimated population of 7,248 and the density of 87.44 persons per km². The total area was 82.89 km².