Gresvatnet (Norwegian) or Graesiejaevrie (Southern Sami)[2] or Gräsvattnet (Swedish) is a lake on the border between Norway and Sweden.

Most of the lake lies in Hemnes Municipality in Nordland county (Norway) and then a small portion crosses the border into Storuman Municipality in Västerbotten County (Sweden).

The lake lies about 25 kilometres (16 mi) east of the village of Korgen, and just a few kilometres northeast of the mountain Oksskolten and the Okstindbreen glacier.

The lake is one of the upper reservoirs for the Bjerka Hydroelectric Power Station.

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