Synopsia sociaria is a species of moth in the family Geometridae.

In the Caucasus, subspecies S. sociaria unitaria is found.

North of the Alps, there is only one generation per year with adults on wing from July to August.

The larvae feed on various plant, including Genista, Artemisia, Echium and Erica species.

Synopsia sociaria propinquaria from Corsica is sometimes treated as a valid subspecies.