The many-spotted hummingbird's primary range is the eastern slope of the Andes from Ecuador's Napo Province through eastern Peru into central Bolivia. It has also been documented in southern Colombia. The International Ornithological Committee places it Brazil and the Clements taxonomy in Argentina. However, the South American Classification Committee of the American Ornithological Society has no records from Brazil; undocumented sight records from Argentina lead the Committee to list it as hypothetical in that country.
