Kota Samarahan is a federal constituency in Samarahan Division (Asajaya District and Samarahan District), Serian Division (Serian District) and Kuching Division (Kuching 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 the first past the post voting system.