Pine Island Fort and Manchester House were trading posts on Pine Island, a small narrow island on the North Saskatchewan River in Saskatchewan, Canada, from 1786 to 1793. Pine Island Fort was a post of the North West Company while Manchester House was a post of the Hudson's Bay Company. Pine Island is on a south-flowing part of the North Saskatchewan River, about 50 km east of Lloyminster. It is just north of the mouth of Big Gully Creek and 18 km northeast of the town of Maidstone. The island is about 1.4 km long and 0.3 km wide.