Argentina (B), Belize (B), Bolivia (B), Brazil (B), Colombia (B), Costa Rica (B), Ecuador (B), El Salvador (B), French Guiana (B), Guatemala (B), Guyana (B), Honduras (B), Mexico (B), Nicaragua (B), Panama (B), Paraguay (B), Peru (B), Suriname (B), Trinidad and Tobago (B), USA (B), Venezuela (B).
Eastern Colombia and eastern Ecuador, east to Venezuela and the Guianas, and south through Amazonian Brazil to northern Maranhío.
 
Population
Estimated population is 2,000,000 (2011).
Grey Hawk (Buteo plagiatus) [XC272339]
by Paul Marvin from San Bernardino National Wildlife Refuge, Cochise County, Arizona, United States (song)
Grey Hawk (Buteo plagiatus) [XC503288]
by Bobby Wilcox from Arroyo Uvalama, \u00c1lamos, Sonora, Mexico (call)
Subspecies
Asturina nitida and Asturina plagiata (Sibley and Monroe 1990, 1993) have been lumped as nitidus following AOU (1998) and moved to the genus Buteo following AOU (2006). Gender agreement of Buteo nitidus follows David and Gosselin (2002a).
Considered by some authors to be a subspecies of Grey-lined Hawk (Buteo nitidus).