Eumorpha triangulum is a moth of the Sphingidae family. It is found in Mexico, Belize, Guatemala, Honduras, Nicaragua, Costa Rica, Panama, Colombia, Ecuador, Peru, Bolivia, Argentina and possibly south-eastern Paraguay.The wingspan is 99–119 mm for males and 103–130 mm for females. It is similar to Eumorpha anchemolus, but the forewing upperside pattern is more contrasting and variegated.