Osprey Island is an island located in Gladhouse Reservoir, Scotland. The largest of the three main islands in the reservoir, it is around 5 acres in size and is completely forested in a thick cover of native Scots Pine and other Broadleaf trees around the edge of the land. Visitors are encouraged to be respectful if they visit the island and avoid disturbing wildlife or important Osprey nesting sites.

The island was formed as the surrounding area was flooded to create the reservoir in 1879, and has since became a mostly disregarded and unexplored piece of land, although it is now extremely rich in wildlife due to little to no human intervention in over 100 years.

Nesting ospreys have been recorded on the island, as well as other birds such as wintering pink-footed geese. The surrounding water is home to trout, and the thick vegetation on the island provides a home and food source to other wildlife.

Work has been done to research and conserve Osprey Island and the surrounding area, although no big steps have been done in recent times.