Iwase (岩瀬町, Iwase-machi) was a town located in Nishiibaraki District, Ibaraki Prefecture, Japan.

In 2003, the town had an estimated population of 22,378 and a density of 256.75 per km². The total area was 87.16 km².

On October 1, 2005, Iwase, the town of Makabe and the village of Yamato (both from Makabe District) were merged to create the city of Sakuragawa.^[1]