The Glossy Antshrike (Sakesphorus luctuosus) is a species of bird in the Thamnophilidae family, the antbirds. The Glossy Antshrike is endemic to Brazil, and can only be found near the Amazon River's outlet at the western Atlantic Ocean, and mostly the southern side of the river-(except southern regions of Amapá state); its range extent west to east is about 3000 km (1,865 mi) in a contiguous region. The range includes the island at the river's mouth Marajó Island, Ilha de Marajo.

Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical swamps.