Polystepha pilulae, the oak leaf gall midge, is a species of gall midge in the family Cecidomyiidae.

[4] The larvae of this species of midge form circular galls that can be flat or convex.

These form on the upper surface of oak leaves of the red oak group (Quercus sect.

The galls are thick-walled and reddish-brown in colour.

This article related to members of the fly infraorder Bibionomorpha is a stub.