Pseudostilpnaspis costaricana is a species of beetle of the family Chrysomelidae. It is found in Costa Rica.
Adults reach a length of about 4.4 mm. The head, pronotum and explanate margin of the elytra are yellowish, while the elytral disc is slightly darker yellowish-red. The legs are yellowish. The six basal segments of the antennae are yellowish-red, while segment 7 is infuscate. The other segments are missing in the holotype.
No host plant has been documented for this species.
The species is named after the type location, Costa Rica.