Batang Sadong is a federal constituency in Samarahan Division (Asajaya District, Simunjan District, and Sebuyau District), Sarawak, Malaysia, that has been represented in the Dewan Rakyat since 1990. The federal constituency was created in the 1987 redistribution and is mandated to return a single member to the Dewan Rakyat under a first-past-the-post voting system.