Neoserica lenangensis is a species of beetle of the family Scarabaeidae. It is found in north-eastern India (western Arunachal Pradesh) and China (Xizang).
Adults reach a length of about 11.2 mm. They have a dark brown, oblong body. The legs are reddish brown and the antennal club is yellowish brown. The dorsal surface is mostly dull and nearly glabrous.
The species name refers to its type locality, Lenang.