Neoserica fluviatica is a species of beetle of the family Scarabaeidae. It is found in Senegal.
Adults reach a length of about 8 mm. They have a dull, brown, oblong-oval, somewhat narrow body, bluish shimmering with an opalescent luster. The frons is finely punctate. The pronotum is densely and finely punctate with weak marginal setae. The antennae are pale yellow.