Gynaecoserica namtamaiensis is a species of beetle of the family Scarabaeidae. It is found in Myanmar and China (Yunnan).
Adults reach a length of about 4.4âÂÂ4.5 mm. They have a dark to reddish brown, oblong body. The antennae are yellowish brown. The dorsal surface (except for the head) is dull and sparsely setose.
The species name refers to the Nam Tamai Valley, where the type specimens were collected.