Ocnosispa humerosa is a species of beetle of the family Chrysomelidae. It is found in Costa Rica.
Adults reach a length of about 12.4 mm. The antennae are black, while the head, pronotum, elytra and legs are reddish yellow. The elytra have yellow with black markings.
The host plant is unknown, but adults have been collected from Conceveiba pleiostemona.
The species name is derived from Latin humerus (meaning shoulder) and refers to the expanded humeri.