Eupithecia vallenarensis is a moth in the family Geometridae. It is found in the regions of Atacama (Huasco Province), Coquimbo (Limari Province), Santiago (Santiago Province), Maule (Linares Province) and Biobio (Biobio Province) in Chile.[1] The habitat consists of the Intermediate Desert, Coquimban Desert, Central Valley and Northern Valdivian Forest biotic provinces.
The length of the forewings is about 8.5-9.1 mm for females. Adults have been recorded on wing in October, November, December and January.
The specific name is based on the type locality.