Cyrtolobus vau is a species of treehopper belonging to the genus Cyrtolobus. It was first described by Thomas Say in 1830.
Cyrtolobus vau is a small species with adults being 5-6 millimetres. Males have a lower pronotal crest than females. Eye color ranges from grayish-brown to red.
Cyrtolobus vau is found across eastern United States. They feed on many types of oaks (Quercus), such as: