Nakatosa is a town located in Takaoka District, Kōchi Prefecture, Japan.
On January 1, 2006 the village of Ōnomi, from Takaoka District, was merged into Nakatosa.
As of March 31, 2017, Nakatosa has an estimated population of 7‚156 and a density of 37 persons per km². The total area is 193.19 km².