Isognathus mossi is a moth of the family Sphingidae.

It is similar to Isognathus menechus but smaller and the ground colour of the body and wings (both above and below) is much darker.

The larvae probably feed on Apocynaceae species.

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

This Dilophonotini-related article is a stub.