Morpho helenor, the Helenor morpho or common blue morpho, is a Neotropical butterfly found in Panama, El Salvador, Nicaragua, Costa Rica, Mexico, Suriname, French Guiana, Bolivia, Colombia, Peru, Ecuador, Venezuela, Honduras, Guatemala, Paraguay, Brazil, Argentina, and in Trinidad and Tobago. It is a species group that may or may not be several species. Many subspecies have been described.