Eupithecia juncalensis is a moth in the Geometridae family. It is found in the Region of Valparaiso (Aconcagua Province) in Chile. The habitat consists of the Central Valley Biotic Province. The length of the forewings is about 9 mm for males and 9.5 mm for females. The forewings are pale grey, with numerous grey and brown scales, resulting in a somewhat mottled appearance. The hindwings are greyish, with dark scaling along the anal margin. Adults have been recorded on wing in November.