Pirenidae is a family of chalcidoid wasps with a cosmopolitan distribution. It was formerly treated as a subfamily within the family Pteromalidae but is now recognized as a distinct family. Members of the family are parasitioid or hyperparasitoid with hosts including Braconidae, Cecidomyiidae, and Coccoidea.
Bodies are 1-2mm long and weakly sclerotized and superficially sculptured. Colors include yellowish, brown, black, and blue metallic.Antenna have a reduced number of flagellomeres.
The subfamilies and genera of Pirenidae include the following: