Segamat is a federal constituency in Segamat District, Johor, Malaysia, that has been represented in the Dewan Rakyat since 1955 to 1959 and 1974 to present.
The federal constituency was created in the 1955 redistribution and is mandated to return a single member to the Dewan Rakyat under the first past the post voting system.
As of 2020, Segamat has a population of 76,011 people.
According to the gazette issued on 31 October 2022, the Segamat constituency has a total of 43 polling districts.
From 1982 to 2018, the Member of Parliament for Segamat was always someone named "Subramaniam" from MIC, but they were three different individuals. From 1982 to 1990 and again from 1995 to 2004, the MP was Subramaniam Sinniah (commonly known as S. Subramaniam). Between 1990 and 1995, the seat was held by S.S. Subramaniam (commonly known as SS). From 2004 to 2018, the seat was represented by Subramaniam Sathasivam.