Iyo Province (伊予国, Iyo-no-kuni?) was an old province of Japan in the area of Ehime Prefecture on the island of Shikoku. The province was sometimes called Yoshū (予州?).
Iyo had borders with Awa, Sanuki, and Tosa Provinces.
The ancient capital city of the province was near modern Imabari.
In the Meiji period, the provinces of Japan were converted into prefectures. The maps of Japan and Iyo Province were reformed in the 1870s.
Ōyamazumi jinja was the chief Shinto shrine (ichinomiya) of Iyo. 
Media related to Iyo Province at Wikimedia Commons