Philonix is a genus of oak gall wasps in the family Cynipidae.

[1][2] Species in this genus are only known from Canada, the United States, and Mexico.

[2] The larvae of Philonix wasps induce galls on white oaks that are typically spherical, soft and fleshy.

[2] Adult wasps are similar in appearance to species in the genus Acraspis.

[2] Many gall wasps have alternate sexual and asexual generations, but this has not been documented in Philonix.