was a town located in Shitsuki District, Okayama Prefecture, Japan.
As of 2003, the town had an estimated population of 5,736 and a density of 71.07 persons per km<sup>2</sup>. The total area was 80.71 km<sup>2</sup>.
On March 1, 2005, Yoshii, along with the town of Bisei (from Oda District), was merged into the expanded city of Ibara.