Sumoto (栖本町; -machi) was a town located in Amakusa District, Kumamoto, Japan.
On March 27, 2006 Sumoto was merged with the towns of Amakusa, Ariake, Goshoura, Itsuwa, Kawaura, Kuratake and Shinwa, all from Amakusa District, and the old cities of Hondo and Ushibuka, to become the new city of Amakusa and no longer exists as an independent municipality.
As of 2003, the town had an estimated population of 2,903 and a density of 88.32 persons per km². The total area was 32.87 km².