was a town located in Niihari District, Ibaraki Prefecture, Japan.
As of 2003, the town had an estimated population of 30,218 and a density of 196.50 persons per km<sup>2</sup>. The total area was 153.78 km<sup>2</sup>.
On October 1, 2005, Yasato was merged into the expanded city of Ishioka.