Aji (庵治町; -cho) was a town located in Kita District, Kagawa, Japan.
On January 10, 2006 Aji, along with the town of and Mure, also from Kita District, the towns of Kagawa and Kōnan, both from Kagawa District, and the town of Kokubunji, from Ayauta District, was merged into the expanded city of Takamatsu and no longer exists as an independent municipality.
As of 2003, the town had an estimated population of 6,392 and a density of 403.79 persons per km². The total area was 15.83 km².
Aji was the main filming location of a Japanese hit movie Crying Out Love, In the Center of the World. When the movie was filmed, this town was chosen as the location where heroes etc lived in high school days.