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

It has been represented by Member of the State Executive Council (EXCO) Rizam Ismail of Barisan Nasional (BN) since 2018.

It is also the smallest Selangor state constituency by the number of voters.

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 Air Tawar's electorate as of 2023[2] According to the gazette issued on 30 March 2018, the Sungai Air Tawar constituency has a total of 15 polling districts.