Mölndal Municipality (Mölndals kommun or Mölndals stad) 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.

In 1911 a municipalsamhälle (a kind of borough within a rural municipality, handling matters of urban character) named Mölndal was instituted in the municipality of Fässberg. In 1922 Fässberg was made the City of Mölndal. In 1971 it was amalgamated with Kållered and Lindome (the latter transferred from Halland County). At the same time it became a municipality of unitary type, like all others in the country. The municipality prefers, however, to style itself Mölndals stad (City of Mölndal) as a semi-official name whenever legally possible. This usage has no effect on the status of the municipality.

The municipality has four main parts: Mölndal, Kållered, Lindome and Hällesåker.

• Mölndal has 37,131 inhabitants (a part of the contiguous Gothenburg urban area)
• Kållered has 7,257 inhabitants
• Lindome has 13,364 inhabitants
• Hällesåker has 900 inhabitants

Numbers from 2003.

This is a demographic table based on Mölndal Municipality's electoral districts in the 2022 Swedish general election sourced from SVT's election platform, in turn taken from SCB official statistics.^[2]

In total there were 69,838 residents, including 51,607 Swedish citizens of voting age.^[2] 48.5% voted for the left coalition and 50.1% for the right coalition. Indicators are in percentage points except population totals and income.

• Gunnebo House from the 18th century.
• Fässberg Church from the 19th century

• Lars Leksell (1907–1986), physician and neurosurgeon

As of November 2021, Mölndal has no twin cities.^[3]

• Eklanda
• Forsåker