The Whillan Beck is a river in the west of the Lake District National Park in the English county of Cumbria.

Administratively, the whole of the course of the Whillan Beck lies in the civil parish of Eskdale and the unitary authority of Cumberland.

It flows into the River Esk at Beckfoot, near the village of Boot, at an altitude of 40 metres (130 ft).

It drains much of the water falling on Scafell, either via the tarn or by a number of streams that join it further downstream, and has a catchment area of 13 square kilometres (5.0 sq mi).

[6][7] The Environment Agency defines a Whillan Beck water body, including its catchment area and tributaries.