Gnathothlibus dabrera is a moth of the Sphingidae family. It is known from Sulawesi.The wingspan is 62-76.8 mm for males and 81.5 mm for females. It differs from Gnathothlibus erotus in its smaller size and darker ground colour. Furthermore, the hindwing upperside has a dark marginal band in the males that is broader than in males of Gnathothlibus erotus, but about as wide as in females of Gnathothlibus erotus.