Izumo Province (出雲国, Izumo-no-kuni?) was an old province of Japan in the area of Shimane Prefecture on the island of Honshū. It was sometimes called Unshū (雲州?).
The province had borders with Iwami, Bingo and Hōki provinces.
In the 8th century, Matsue became the provincial capital city.
In the Meiji period, the provinces of Japan were converted into prefectures. The maps of Japan and Izumo Province were reformed in the 1870s.
Izumo taisha was the chief Shinto shrine (ichinomiya) of Izumo. 
Media related to Izumo Province at Wikimedia Commons