Aioi (相生町; -cho) was a town located in Naka District, Tokushima, Japan.
On March 1, 2005 Aioi was merged with the towns of Kaminaka and Wajiki, and the villages of Kisawa and Kito, all from Naka District, to form the new city of Naka.
As of 2003, the town had an estimated population of 3,208 and a density of 31.75 persons per km². The total area was 101.04 km².