阿基米斯基岛（Akimiski Island）是加拿大的岛屿，位于詹姆斯湾，由基吉柯塔鲁克地区负责管辖，属于北极群岛的一部分，长86公里、宽32公里，面积3,001平方公里，最高点海拔高度31米，岛上无人居住。

Akimiski Island is the largest island in James Bay (a southeasterly extension of Hudson Bay), Canada, which is part of the Qikiqtaaluk Region of the territory of Nunavut. It has an area of 3,001 km (1,159 sq mi), making it the 163rd largest island in the world, and Canada's 29th largest island. Akimiski Island is only 19 km (12 mi) from the province of Ontario. From the western side of the island, one can see the Ontario coastline.