Sungai Panjang is a state constituency in Selangor, Malaysia, that has been represented in the Selangor State Legislative Assembly since 1974.

It has been represented by Mohd Razali Saari of Perikatan Nasional (PN) since 2023.

The state constituency was created in the 1974 redistribution and is mandated to return a single member to the Selangor State Legislative Assembly under the first past the post voting system.

Ethnic breakdown of Sungai Panjang's electorate as of 2023[2] According to the federal gazette issued on 30 March 2018, the Sungai Panjang constituency is divided into 19 polling districts.

[3] "Federal Government Gazette - Notice of Contested Election, State Legislative Assembly for the State of Selangor [P.U.