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The River Greta is a river in Cumbria. It is a tributary of the River Derwent and flows through the town of Keswick. "Greta" derives from the Old Norse "Griótá", meaning "stony stream".
The source of the river is near Threlkeld, at the confluence of the River Glenderamackin and St. John's Beck. From there, the river runs westward, roughly aligned with the former Cockermouth, Keswick and Penrith Railway between Keswick and Penrith. The river subsequently flows through Keswick before joining the Derwent just after the latter flows out of Derwentwater.
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