Oshima (渡島国, -no kuni) was a short-lived province located in Hokkaidō. It corresponded to the southern part of today's Oshima and Hiyama Subprefectures

History

• August 15, 1869 Oshima Province established with seven districts
• 1872 Census reports 75,830 inhabitants of the province
• July, 1881 Tsugaru District and Fukushima District merged to form Matsumae District, reducing the number of districts to six.
• 1882 Provinces dissolved in Hokkaido.

Districts

• Kameda (亀田郡, -gun))
• Kayabe (茅部郡)
• Kamiiso (上磯郡)
• Fukushima (福島郡), merged with Tsugaru District in 1881 to form Matsumae District
• Tsugaru (津軽郡), merged with Fukushima District in 1881 to form Matsumae District
• Hiyama (檜山郡)
• Nishi (爾志郡)