Niingsvatnet (Norwegian) or Meahccejávri (Northern Sami) is a Norwegian lake that lies high in the mountains on the border Evenes Municipality in Nordland county and Tjeldsund Municipality in Troms county.

The water from the lake flows through a pipe down to the hydroelectric powerstation near the village of Bogen in Evenes Municipality. The powerstation is owned by Evenes Kraftforsyning and is situated at almost 500 m (1,600 ft) lower than the lake Niingsvatnet. The water from the powerstation then flows into the Strandvatnet lake. A short river goes from Strandvatnet past the village of Bogen to the Ofotfjorden.