The White-winged Black-tyrant (Knipolegus aterrimus) is a species of bird in the Tyrannidae family. It has often included the Brazilian Black-tyrant (K. franciscanus) as a subspecies. It is found in Argentina, Bolivia, Chile, Paraguay, Peru, and Uruguay. Its natural habitats are subtropical or tropical moist montanes, subtropical or tropical moist shrubland, and heavily degraded former forest.