Hemaris radians is a moth of the Sphingidae family. It is known from southern Siberia, Mongolia, the southern Russian Far East, north-eastern and central-eastern China, the Korean Peninsula and Japan.

The wingspan is 37–40 mm. The forewing discal cell is longitudinally divided by a distinct or vestigial scale fold, rarely undivided. There are two forms, form mandarina and form radians. Adults are on wing from mid May to late July in Korea.

The larvae have been recorded feeding on Lonicera and Rubia species in the Russian Far East and Lonicera japonica in Korea.