Tosaminato (十三湊) was a port settlement which existed from the Heian to the Muromachi period located in what is now part of the city of Goshogawara, Aomori in the Tōhoku region of Japan.

[2] Tosaminato was located on the narrow strip of land which separate Lake Jūsan from the Sea of Japan on the west coast of Aomori Prefecture.

The Nanbu developed Noheji on Mutsu Bay as their main port for contact with Ezo, as it was more convenient to their seat at Sannohe Castle and later to Morioka, and Tosaminato eventually silted up, becoming largely unusable.

The Tsugaru attempted to redevelop Tosaminato as a port on the kitamaebune trade routes to take their rice and timber to markets in Osaka and to re-establish contacts with Ezo, but it never regained its former prosperity The archaeological site is roughly triangular in shape and covers around 55 hectares, approximately 2 km north–south and up to 500 m east–west.

The north sector included the Andō residence, surrounded by those of their vassals, a temple, and the port itself.