Eupithecia malchoensis is a moth in the Geometridae family. It is found in the regions of Maule (Linares Province) and Biobio (Nuble Province) in Chile. The habitat consists of the Central Valley Biotic Province. The length of the forewings is about 8.5 mm for males and 10 mm for females. The forewings are brown, with greyish brown and reddish brown scaling. The hindwings are pale greyish white anteriorly, with grey and blackish brown scales posteriorly. Adults have been recorded on wing in November and December.