Isognathus scyron is a moth of the family Sphingidae.

It is known from Suriname, French Guiana, Cuba, Costa Rica and Guatemala.

There are distinct bands on the upperside of the abdomen and the underside of the abdomen is dirty white or slightly buff, faintly speckled with russet scales.

The outer half of the forewing upperside has grey vein-streaks which are interrupted by black dots.

They have long tails and are very colourful, suggesting they are unpalatable to birds.