Alcock Tarn

{{Short description|Tarn in Cumbria, England}}

{{Use British English|date=July 2020}}

{{Use dmy dates|date=July 2020}}

{{Infobox body of water

| name = Alcock Tarn

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| image = Alcock Tarn - geograph.org.uk - 5524.jpg

| alt = Picture of a tarn in Cumbria, England

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| location = Cumbria, England

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| coordinates = {{coord|54|27|44|N|3|0|20|W|region:GB_type:waterbody|display=title,inline}}

| type = Lake

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| pushpin_map = Cumbria

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File:Alcock Tarn above Grasmere - geograph.org.uk - 797357.jpg

Alcock Tarn is a lake in Westmorland and Furness, Cumbria, England. It is located high in the fells on Heron Pike,{{cite book|last1=Nuttall|first1=John|last2=Nuttall|first2=Anne|title=The Tarns of Lakeland|url=https://books.google.com/books?id=6LK7ODv3MZUC&pg=PA109|year=1996|publisher=Cicerone Press Limited|isbn=978-1-85284-210-9|page=109}} roughly a mile and a half east of Grasmere.{{cite book|last=Tetley|first=Laurence|title=The Lake District Angler's Guide|url=https://books.google.com/books?id=AYjCctqM3M8C&pg=PA75|year=2004|publisher=Cicerone Press Limited|isbn=978-1-85284-283-3|page=75}}

Alcock Tarn was originally known as Butter Crags Tarn and was enlarged by means of a stone and earth dam in the 19th century to a depth of about {{cvt|6|ft}}. The owner, a Mr Alcock of Grasmere, then stocked it with brown trout.Blair, Don: Exploring Lakeland Tarns: Lakeland Manor Press (2003): {{ISBN|0-9543904-1-5}}