Hayesiana triopus, the nonsuch hawkmoth, is a moth of the family Sphingidae.

The abdomen upperside is black with an interrupted belt of red and lateral orange spots.

The forewing upperside is dark grey green with six narrow transverse blackish bands.

The hindwing upperside is black with a conspicuous white costal patch and tornal area.

Adults are attracted to the flowers of Agapanthus africanus in Hong Kong.