River Cocker

Geobox|River
name = Cocker
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country = United Kingdom
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source_name = Crummock Water
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mouth_location = confluence with River Derwent
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map_caption = :"For the river in Lancashire, see River Cocker (Lancashire)."

The River Cocker is a river in the Lake District of north-west England, in the county of Cumbria. Its source is at the head of the Buttermere valley. It flows north through Buttermere and then Crummock Water, through Lorton Vale, to the town of Cockermouth, where it joins the River Derwent. It is roughly 12 miles long.

The river supports a range of wildlife, the predominant fish species include, Salmon, Sea trout. Brown trout, Eels, Minnowa Sticklebacks and the Stone Loach.