Notsu (野津町 Notsu-machi?) was a town located in Ōno District, Ōita Prefecture, Japan.
As of 2003, the town had an estimated population of 9,309 and the density of 66.88 persons per km². The total area was 139.19 km².
On January 1, 2005, Notsu was merged into the expanded city of Usuki.