Cynips is a genus of gall wasps in the tribe Cynipini, the oak gall wasps. One of the best known is the common oak gall wasp (Cynips quercusfolii), which induces characteristic spherical galls about two centimeters wide on the undersides of oak leaves.

As of 2008, there are about 39 species in this genus.

Some authors have included Antron in Cynips but it was recently resurrected as a distinct genus.

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