Laisälven (Ume Sami: Lájssuo) is a river in central Lapland, in the municipalities of Arjeplog and Sorsele, Sweden with a length of 190 km. The catchment area is about 3 000 km2. The Laisälven is the largest tributary of the Vindelälven.
The Laisälven river is of national interest for cultural environment conservation.
