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The River Spey (Scottish Gaelic: Uisge Spè) is 107 miles (172 km) long; the ninth longest river in the United Kingdom, as well as the third longest (and fastest-flowing) river in Scotland. It is important for salmon fishing and whisky production (Speyside distilleries produce more whisky than any other region).

The river rises at over 1,000 feet at Loch Spey in Corrieyairack Forest in the Scottish Highlands, 10 miles south of Fort Augustus. The river descends through Newtonmore and Kingussie, crossing Loch Insh before reaching Aviemore, giving its name to Strathspey. From there it flows the remaining 60 miles north-east to the Moray Firth. The Spey spates quickly due to its wide mountainous catchment area as a result of rainfall or snow-melt.