Alingsås Municipality (Alingsås kommun) is a municipality in Västra Götaland County in western Sweden. Its seat is located in the city of Alingsås.

The present municipality was formed in 1974 then the former City of Alingsås (itself a municipality of unitary type since the subdivision reform of 1971) was amalgamated with Bjärke and Hemsjö.

Alingsås is part (together with 12 other municipalities) of the Gothenburg Metropolitan Area with 900,000 inhabitants. As of 31 December 2021 Alingsås Municipality had 41,853 inhabitants, most of which lived in Alingsås city (ca 25,000).

This is a demographic table based on Alingsås Municipality's electoral districts in the 2022 Swedish general election sourced from SVT's election platform, in turn taken from SCB official statistics.^[3]

In total there were 41,777 residents, including 31,871 Swedish citizens of voting age.^[3] 49.1% voted for the left coalition and 49.4% for the right coalition. Indicators are in percentage points except population totals and income.

Alingsås has seven sister cities:

• Leisi, Estonia
• Karis, Finland
• Kartong, Gambia
• Mont-de-Marsan, France
• Ocatal, Nicaragua
• Skedsmo, Norway
• Tårnby, Denmark