Protaleuron rhodogaster is a moth of the family Sphingidae.

The forewing underside is olive-brown in the basal two-thirds, washed with clay-colour.

The discal area is crimson coral-red, with traces of lines.

The hindwing underside is pinkish-crimson from the costal margin beyond the discal cell, while the anal area is olive clay-colour.

Females are similar to males, but have broader forewings and a more contrasting pattern, with a conspicuous pale buff patch on the outer margin.