Cypa decolor is a species of moth of the Sphingidae family. It is found in northeastern India, Nepal, Myanmar, southwestern China, Thailand, Vietnam, Malaysia (Sarawak) and Indonesia (Sumatra, Borneo, Kalimantan, Papua New Guinea). The wingspan is 50–82 mm. The males tend to be more variegated than the females. It is similar to Cypa terranea but is greener brown above. The larvae feed on Quercus and Castanopsis species.