Demak Laut is a state constituency in Sarawak, Malaysia, that has been represented in the Sarawak State Legislative Assembly since 1996.
The state constituency was created in the 1996 redistribution and is mandated to return a single member to the Sarawak State Legislative Assembly under the first past the post voting system.
As of 2020, Demak Laut has a population of 45,678 people.
According to the gazette issued on 31 October 2022, the Demak Laut constituency has a total of 11 polling districts.