Muar is a federal constituency in Muar District, Johor, Malaysia, that has been represented in the Dewan Rakyat since 1974.
The federal constituency was created in the 1974 redistribution and is mandated to return a single member to the Dewan Rakyat under the first-past-the-post voting system.
As of 2020, Muar has a population of 100,265 people.
According to the federal gazette issued on 31 October 2022, the Muar constituency is divided into 33 polling districts.