Cloudy day by Ennerdale Water, Cumbria

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Ennerdale Water is the most westerly lake in the Lake District National Park in Cumbria, England. It is a glacial lake, with a maximum depth of 150 feet (45 metres), and at ½ mile to a mile (700 to 1,500 metres) wide and 2½ miles (3.9 kilometres) long is one of the smallest lakes in the area. To the west of the lake lies the small village of Ennerdale Bridge, consisting of two pubs and a few houses.

The lake has been referred to in guidebooks and maps variously as "Brodewater" (1576), "Brodwater" (1695), "Broad Water" (1760), "Ennerdale Water" (1784) and "Ennerdale Lake" in Otley's Guide (1823). It is now the Ordnance Survey convention to name it "Ennerdale Water".

The lake lies in the eponymous valley of Ennerdale, surrounded by some of the highest and best-known fells in Cumbria including: Great Gable (899 m), Green Gable, Brandreth, High Crag, Steeple and Pillar. Ennerdale Water is fed by the River Liza and other streams, and in turn feeds the River Ehen, which runs to the Irish Sea.

Although the lake is natural, in 1902 a shallow weir was added to what is probably a glacial moraine to maintain the level. The lake is owned by United Utilities, which abstracts water to serve customers in the Whitehaven area.

United Utilities plans to stop using Ennerdale as a source of water by 2025, as the Environment Agency has confirmed that it will withdraw the abstraction licence to protect the environment of Ennerdale, its lake and the River Ehen.