Eupithecia undata is a moth in the family Geometridae first described by Christian Friedrich Freyer in 1840. The North American Moth Photographers Group lists it as a synonym of Eupithecia lafontaineata. It is found in the Pyrenees, Alps, the Massif Central, the Tatra mountains, on the Balkan Peninsula and in Romania. It is also found in North America, where it has been recorded from Wyoming, Montana, Idaho, Colorado, Nevada and Oregon.