Iyo Province (伊予国, Iyo-no-kuni) was an old province of Japan in the area that is today Ehime Prefecture on Shikoku. Iyo bordered on Awa, Sanuki, and Tosa Provinces. It was sometimes called Yoshū (予州) .
The ancient provincial capital was near modern Imabari. During the Sengoku Period it was split into several fiefs, the largest one usually being run from Matsuyama Castle in Matsuyama. It was briefly unified by the Chōsokabe clan of neighboring Tosa, but Toyotomi Hideyoshi invaded Shikoku in 1584 and reallocated the fiefs. During the Edo Period the province was controlled by Uwajima Domain.
The people spoke Iyo-ben.
Ehime Prefecture
Iyo District (伊予郡) - absorbed remaining parts of Shimoukena District on April 18, 1896
Kazahaya District (風早郡) - merged into Onsen District (along with Kume and Wake Districts, with parts of Shimoukena District) on April 18, 1896
Kita District (喜多郡)
Kume District (久米郡) - merged into Onsen District (along with Kazahaya and Wake Districts, with parts of Shimoukena District) on April 18, 1896
Kuwamura District (桑村郡) - merged with Shūfu District to become Shūsō District (周桑郡) on April 18, 1896
Nii District (新居郡) - dissolved
Noma District (野間郡) - merged into Ōchi District on April 18, 1896
Ōchi District (越智郡) - absorbed Noma District on April 18, 1896
Onsen District (温泉郡) - absorbed Kazahaya, Kume and Wake Districts, along with parts of Shimoukena District, on April 18; 1896; now dissolved
Shūfu District (周布郡) - merged with Kuwamura District to become Shūsō District on April 18, 1896
Uma District (宇摩郡) - dissolved
Ukena District (浮穴郡)
Kamiukena District (上浮穴郡)
Shimoukena District (下浮穴郡) - dissolved to split into Onsen and Iyo Districts on April 18, 1896
Uwa District (宇和郡)
Higashiuwa District (東宇和郡) - dissolved
Kitauwa District (北宇和郡)
Minamiuwa District (南宇和郡)
Nishiuwa District (西宇和郡)
Wake District (和気郡) - merged into Onsen District (along with Kazahaya and Kume Districts, with parts of Shimoukena District) on April 18, 1896
