Neoserica biuncinata is a species of beetle of the family Scarabaeidae. It is found in China (Sichuan).
Adults reach a length of about 9.1 mm. They have a reddish brown, oblong body. The antennae are yellow and the dorsal surface is dull and nearly glabrous.
The species name is derived from Latin bi- (meaning twice) and uncinatus (meaning hook shaped) and refers to the shape of its aedeagus.