Hanzan (飯山町; -cho) was a town located in Ayauta District, Kagawa, Japan.
On March 22, 2005 Hanzan, along with the town of Ayauta, also from Ayauta District, was merged into the expanded city of Marugame and no longer exists as an independent municipality.
As of 2003, the town had an estimated population of 17,183 and a density of 857.86 persons per km². The total area was 20.03 km².