Mölndal is the seat and administrative centre of Mölndal Municipality and a part of the Gothenburg urban area on the west coast of Sweden. About 40,000 of the municipality's 60,000 inhabitants live in Mölndal proper.

Mölndal Municipality is a municipality in Västra Götaland in western Sweden, just south of Gothenburg. Its seat is located in Mölndal, which lies within the Gothenburg urban area, and the whole municipality is part of Metropolitan Gothenburg.