Kuchinotsu (口之津町, Kuchinotsu-chō) was a town located in Minamitakaki District, Nagasaki Prefecture, Japan. As of 2003, the town had an estimated population of 6,450 and a density of 646.29 persons per km². The total area was 9.98 km². On March 31, 2006, Kuchinotsu, along with the towns of Arie, Fukae, Futsu, Kazusa, Kitaarima, Minamiarima and Nishiarie (all from Minamitakaki District), was merged to create the city of Minamishimabara.