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Buttermere is a lake in the English Lake District in North West England. The adjacent village of Buttermere takes its name from the lake.

The lake is 1.25 miles (2,010 m) by .25 miles (400 m) wide, and is 75 feet (23 m) deep. It has an elevation above sea level of 329 feet (100 m). A place of considerable scenic value, it is situated towards the head of the valley of the River Cocker and is surrounded by fells, notably the High Stile range to the south west, Robinson to the north east, Fleetwith Pike and Haystacks to the south east and Grasmoor to the north west.

There are two possible origins for the name "Buttermere":

One, that Buttermere means "the lake by the dairy pastures" (from the Old English "butere mere"). Whaley suggests this as the correct interpretation: " 'butter lake, the lake with good pasture-land', from OE 'butere' 'butter', conveying the fertile nature of the flat alluvial land at both ends of the lake, plus 'mere' 'lake',..."

Two, that it is the corrupt form of a personal name. Robert Ferguson asserts in his 1866 work, "The Northmen in Cumberland and Westmoreland" that Buttermere derives from the Old Norse personal name "Buthar", as in "Buthar's mere" (lake). This accords with local tradition, which says that the valley of Buttermere was part of the holdings of an 11th-century Norse chieftain called "Buthar" (sometimes spelt "Boethar").