Xenoserica matthiasi is a species of beetle of the family Scarabaeidae. It is found in Nepal.
Adults reach a length of about 11.2 mm. They have a dark reddish brown, oblong body. The elytral striae are reddish and the antennae are yellow. The dorsal surface is dull and, except for a few short setae on the elytra, glabrous.
The species is named after its collector, Matthias Hartmann.