Gastroserica lucens is a species of beetle of the family Scarabaeidae. It is found in India (Arunachal Pradesh).
Adults reach a length of about 5.7-6.4 mm. They have a strongly shiny, short, oval body. The ventral surface is dark brown and the dorsal surface is blackish and nearly glabrous. The legs are yellowish.
The species name is derived from Latin lucens and refers to the shiny dorsal surface.