Rhagastis lunata, the lunulate mottled hawkmoth, is a moth of the family Sphingidae.

The antenna are longer and thicker than in all other Rhagastis species, except Rhagastis gloriosa (from which it differs in the lack of dark red bands on the forewing upperside, the apical black scaling being confined to the distal segments).

The forewing upperside has a characteristic bluish-white submarginal line formed of crescent-shaped marks, the horns of which are directed basally.

The black basal area of the forewing is reduced to a streak or patch behind the discal cell.

The hindwing upperside has a well-defined orange-beige median band, including a series of vein dots.