Vettasjärvi is a lake in the municipality of Gällivare in Lapland and is part of the main catchment area of the Kalix River.

The average altitude is 362 metres above sea level and the area is 33.01 square kilometres.

The river Ängesån draining the catchment area has tributary order 3, which means that the water flows through a total of 3 watercourses before reaching the sea after 228 kilometres.

The catchment area has 9.84 square kilometres of water surface, giving it a lake percentage of 29.8%.

The lake was used by Sami people in the Lapp village of Siggevara or Lullebyn (Nederbyn), which covered the eastern part of Jukkasjärvi parish.