Langisjór (Icelandic pronunciation: [ˈlauɲcɪˌsjouːr̥] ^ⓘ) is a lake in the western part of Vatnajökull National Park, Iceland. It is around 20 km in length and up to 2 km wide, with a total surface area of about 26 km² (10 sq mi) and a depth of 75m at its deepest point.

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Langisjór
in summer
Langisjór
Coordinates	64°11′N 18°15′W
Basin countries	Iceland
Max. length	20 km (12 mi)
Max. width	2 km (1.2 mi)
Surface area	26 km2 (10 sq mi)
Max. depth	75 m (246 ft)
Surface elevation	670 m (2,200 ft)

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The lake is situated rather far from civilisation at the south-western border of Vatnajökull at an altitude of 670 m above sea level. Environmental campaigners have expressed concern at government plans to site an industrial dam on the lake.

• List of lakes of Iceland