Neoserica flexiclava is a species of beetle of the family Scarabaeidae. It is found in Laos.
Adults reach a length of about 5.8 mm. They have a reddish-brown, elongate-oval body. The underside is dark brown, and the head and pronotum are also dark brown, but partly with a greenish sheen. The dorsal surface is densely covered with light, short hairs, interspersed with long, strong, lighter hairs. The underside is densely covered with hairs.
The species name is derived from Latin flexus (meaning bent) and clavus (meaning key) referring to the bent clavus of the antennae.