Tsushima han

• Kokudaka: 100,000
• Other Names: 対馬府中藩 (Tsushima Fuchuu han)
• Japanese: 対馬藩 (Tsushima han)

Tsushima han, based on Tsushima Island (today part of Nagasaki prefecture), was the domain of the Sô clan, and managed relations with Joseon Dynasty Korea. The territory of the domain also included small areas known as tobichi on the mainland of the island of Kyushu, in Hizen and Chikuzen provinces. The domain was ranked at 100,000 koku, though its actual agricultural production was equivalent to less than 10,000. The enhanced kokudaka ranking is usually said to either be a reflection of the importance of the Korea trade and the measure of the economic benefit from it, or a result of the necessity for the Sô clan to possess a higher rank and title in order to represent Japan honorably and effectively in interactions with Korea.

At the peak of the Korea trade, the population of the domain was around 30,000, with half the population living in the castle town of Fuchû.

The trade with Korea was quite sizable, amounting, in the 1710s-1730s for example, to 30,000 kan of silver, or roughly 8% of all silver coins minted in Japan during that time.