Eucyclodes semialba is a moth of the family Geometridae first described by Francis Walker in 1861.

[1] It is found in Sri Lanka,[2] the north-east Himalayas of India, Myanmar and Sundaland.

A conspicuous submarginal black spot is found centrally in the ventral side.

Anterior and posterior segments pale purplish brown.

Pupa greenish with minute purplish-brown speckles.