Marumba sperchius is a species of moth of the Sphingidae family. It is found from north-western India across north-eastern India, south-western, central and eastern China to the southern Russian Far East, North Korea, South Korea and Japan. It is also present on Sumatra and Borneo. The wingspan is 88–138 mm. It is similar to Marumba juvencus, but the lines of the forewing and the ground colour of the hindwing are more reddish and the lines on either side of the weak discal spot are hardly converge.