Luktvatnet is a lake that lies in the northern part of the municipality of Vefsn in Nordland county, Norway. The lake lies between the mountains Korgfjellet and Lukttinden, about 5 kilometres (3.1 mi) south of Elsfjord. The European route E06 highway passes along the northern shore of the lake.
The name is probably from the Southern Sami language word Loektejaevrie. This is a compound of loekti which means "inlet" and jaevrie which means "lake", thus it is "the lake with many inlets".