Forsinard Flows is a national nature reserve (NNR) covering much of the area surrounding Forsinard in the Highland council area of Scotland. It lies at the heart of the Flow Country, a large, rolling expanse of peatland and wetland area of Caithness and Sutherland that makes up almost 5% of the world's blanket bog. The reserve is managed by the Royal Society for the Protection of Birds (RSPB), and is designated a Category II protected area by the International Union for Conservation of Nature. Much of the NNR overlaps with the designated area of the Caithness and Sutherland Peatlands Special Protection Area and Special Area of Conservation.

The national nature reserves (NNRs) of Scotland are areas of land or water designated under the Wildlife and Countryside Act 1981 as containing habitats and species of national importance. National nature reserves can be owned by public, private, community or voluntary organisations but must be managed to conserve their important habitats and species, as well as providing opportunities for the public to enjoy and engage with nature. There are currently 43 NNRs in Scotland, which cover 154,250 hectares (1,542.5 km2), or less than 1.5% of the land area of Scotland. They range in size from Corrieshalloch Gorge at 7 ha to Mar Lodge Estate, which covers 29,324 ha.