Kozakai

 was a town located in Hoi District, Aichi Prefecture, Japan.
As of November 1, 2007, (the last census information available) the town had an estimated population of 22,708 and a population density of 2,188.31 persons per km². The total area was 9.92 km².
On February 1, 2010, Kozakai was merged into the expanded city of Toyokawa. Therefore, Hoi District was dissolved as a result of this merger.