Meganoton nyctiphanes is a moth of the family Sphingidae. It is known from Sri Lanka, India, Bangladesh, Myanmar, the Nicobar Islands, the Andaman Islands, south-eastern China, Thailand, Vietnam, Malaysia, Indonesia (Sumatra) and the Philippines (Palawan). The wingspan is 120–140 mm. It is variable in size and forewing upperside ground colour (when paler the lines appear more prominent). There is a pale band on the hindwing upperside which is slightly variable in position. The larvae have been recorded feeding on Symphorema involucratum in Thailand.