Okuizumo (奥出雲町, Okuizumo-chō) is a town located in Nita District, Shimane Prefecture, Japan.

[4] During the Edo Period, the area was mostly under the control of Matsue Domain, which was ruled mostly by various branches of the Matsudaira clan under the Tokugawa shogunate.

After the Meiji restoration, the village of Minari (三成村) was established on April 1, 1889 with the creation of the modern municipalities system.

Minari merged with four surrounding villages to form the town of Nita (仁多町) on April 15, 1955.

Okuizumo has a mayor-council form of government with a directly elected mayor and a unicameral town council of 14 members.

In terms of national politics, the town is part of the Shimane 1st district of the lower house of the Diet of Japan.