Tahara Domain (田原藩, Tahara-han) was a minor fudai Japanese domain under the Tokugawa shogunate of Edo period Japan, located in southern Mikawa Province (modern-day southeastern Aichi Prefecture), Japan.
Most of the Atsumi Peninsula was controlled by the Toda clan during the Muromachi and Sengoku periods.
The Toda accompanied Ieyasu to Edo and were reduced in status to hatamoto with a minor 5000 koku holding in Shimoda in Izu Province.
In 1664, his son Toda Tadamasa, was transferred to Amakusa Domain in Bungo Province with an increase in revenues to 21,000 koku and Tahara Domain was reassigned to the Miyake clan, who remained in residence until the Meiji Restoration.
[1] At the end of the Edo period, its holdings consisted of 34 villages in Atsumi District, Mikawa Province.