Gastroserica vinhphuensis is a species of beetle of the family Scarabaeidae. It is found in Vietnam.
Adults reach a length of about 7.3âÂÂ8.6 mm. They have a yellowish brown, egg-shaped, oval body. There are sometimes two symmetrical dark stains on the disc of the pronotum. The dorsal surface is nearly glabrous, except for the cilia along the margins.