Neoserica rubiginea is a species of beetle of the family Scarabaeidae. It is found in China (Guangxi, Guizhou) and Vietnam.
Adults reach a length of about 9.2 mm. They have a reddish brown, oblong body. The antennal club is yellowish brown, the dorsal surface is dull and nearly glabrous and the anterior labroclypeus is shiny.