Calloserica rupthangensis is a species of beetle of the family Scarabaeidae. It is found in eastern central Nepal.
Adults reach a length of about 8.4-8.6 mm. They have a dark brown, oblong body, with a greenish shimmer in some areas. The dorsal surface is dull and densely covered with upright hairs, partly interspersed with short white scales.
The species is named for the type locality, Rupthang.