Cacopsylla ulmi is an insect of the Psyllidae family.

[1] Cacopsylla ulmi is a widespread species in Europe, including Britain and the Balkans.

Adults are 3.6–4.3 mm long.

The genal cones are laterally somewhat concave, and 0.25 mm long .

This Hemiptera article related to members of the insect suborder Sternorrhyncha is a stub.