Euchromia magna is a moth of the subfamily Arctiinae.

It is found in India and Sri Lanka.

Antennae with white distal part.

Forewing with a small sub-basal, two large medial, one sub-apical and two sub-marginal hyaline spots.

Hindwings with a large basal hyaline patch crossed by the sub-costal and median veins and a sub-marginal spot crossed by veins 4 and 6.