Euchromia polymena is a species of day flying moth of the subfamily Arctiinae.

It is found in India and south-eastern Asia, as well as on Sumatra, Java, Sulawesi, Peninsular Malaysia, Borneo and the Philippines.

The body is black, with a blue spot on the vertex of the head.

The hindwing displays trifid basal and quadrified post-medial orange spots.

[4] The eggs are shiny pale yellow spheres, and laid in groups under a leaf of a food plant.