Gastroserica sichuana is a species of beetle of the family Scarabaeidae. It is found in China (Sichuan) and possibly Vietnam.
Adults reach a length of about 7-7.8 mm. They have a dark reddish-brown, egg-shaped, oval body, with the pronotum, labroclypeus, scutellum and legs yellowish brown. There are two symmetric, dark green stains on the pronotum.