The River Isla (Scottish Gaelic: Uisge Ìl) is a tributary of the River Tay in Angus and Perthshire, Scotland. It rises in the Grampians before flowing down through Glen Isla into the Valley of Strathmore. After a course of 46 miles (74 km), it falls into the Tay near Meikleour. Its tributaries include the Ericht.

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  The river flowing through Glen Isla
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  Reekie Linn falls
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  The confluence of the Isla and the Ericht
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  The Bridge of Couttie, near Coupar Angus
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  The river at Meikleour
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  The confluence of the Isla and the Tay (grid reference NO519379)

• Eassie Stone
• Kilry Glen
• Kinloch

56°31′38″N 3°21′44″W / 56.52711°N 3.36224°W / 56.52711; -3.36224