Agden Reservoir is a water storage reservoir, situated at grid reference SK260925, 6.5 miles (10 km) west of the centre of Sheffield, South Yorkshire, England. It is owned by Yorkshire Water which is part of the Kelda Group. The reservoir covers an area of 25 hectares and has a capacity of 559 million gallons (2.11x109 litres) of water, the dam wall has a width of approximately 350 metres with a height of 30 metres.