Grand Falls-Windsor—Buchans is a provincial electoral district for the House of Assembly of Newfoundland and Labrador, Canada.

Prior to 2006, the district was Grand Falls-Buchans, while expanded slightly in all directions it took in no major municipalities.

Includes part of the town of Grand Falls-Windsor to the north and stretches westward.

Badger, Buchans, Buchans Junction, Crooked Lake, Millertown and Red Indian Lake are in the district.

The district has elected the following members of the House of Assembly: