Mullsjö Municipality () is a municipality in Jönköping County, southern Sweden. Its seat is in the locality of Mullsjö.
The municipality was formed in 1952 by the amalgamation of four former entities. In 1998 it was transferred from the dissolved Skaraborg County to Jönköping County.
The geography is known for its many lakes and canoeing waters. In the winter, one may enjoy winter sports activities such as cross-country and down-hill skiing.
There is also a folk high school in Mullsjö.
Localities
There are 2 urban areas (also called a Tätort or locality) in Mullsjö Municipality.
In the table the localities are listed according to the size of the population as of December 31, 2005. The municipal seat is in bold characters.
{| class="wikitable"
! # !! Locality !! Population
|-
| 1 || Mullsjö || 5,508
|-
| 2 || Sandhem || 706
|}
Demographics
This is a demographic table based on Mullsjö Municipality's electoral districts in the 2022 Swedish general election sourced from SVT's election platform, in turn taken from SCB official statistics.
In total there were 7,427 residents, including 5,604 Swedish citizens of voting age.