Fewston Reservoir lies in the Washburn Valley, north of Otley and west of Harrogate in Yorkshire, England.

Built in 1879 by the Leeds Waterworks Company, it is managed by Yorkshire Water and sits directly above Swinsty Reservoir, with the two sharing an embankment and a car park at their southern end.

The reservoir is easily reached from the A59 road near Blubberhouses. The site is popular with walkers and runners, and cyclists and horse-riders have their own permitted tracks through the surrounding woodlands.

Fishing is available through the Washburn Valley Fishery. Paths are wide and well-surfaced with only moderate inclines, making the route broadly accessible.

Parking is available at Blubberhouses and Swinsty Moor car parks, with accessible toilets at the latter.