Chiasmia nora is a moth in the family Geometridae, described by Francis Walker in 1861.

It is found in northern India, Sri Lanka, south-eastern Asia and probably throughout Sundaland.

Very similar to Semiothisa eleonora, differs from black suffusion especially beyond the medial band of both wings.

[2] Larva greenish, with light, dull yellow longitudinal bands.

It was observed to drink the droplets exuded from the anus of a mosquito while it was sucking blood from a water buffalo.