Manduca bergi is a moth of the family Sphingidae. It is found in Argentina and Bolivia. The wingspan is about 83 mm. The body and wings are greyish creamy buff, dusted with brown and ochreous scales. The head and thorax are without markings, but there are small black lateral patches on the abdomen. The underside of both wings is slightly pinkish. The forewing underside is much more shaded with brown than the upperside. The hindwing upperside is blackish brown. Adults are on wing from January to February, in April, September and November.