Neoserica arunachalana is a species of beetle of the family Scarabaeidae. It is found in India (Arunachal Pradesh).
Adults reach a length of about 6.9-7.4 mm. They have a reddish brown, oval body. The dorsal surface is mostly dull and densely covered with long and short adjacent setae.
The species name refers to its occurrence in the Arunachal province.