The Pteromalidae are a large family of wasps, the majority being parasitoids of other insects. They are found throughout the world in virtually all habitats, and many are important as biological control agents. The oldest known fossil is known from the Early Cretaceous.

Prior to 2022, the subfamily-level divisions of the family were highly contentious and unstable, and the family was thought to be "artificial", composed of numerous, distantly related groups (polyphyletic). In essence, a "pteromalid" was any member of the Chalcidoidea that had five-segmented tarsi and did not have the defining features of any of the remaining families with five-segmented tarsi.

In 2022, the Pteromalidae was split into 24 families.

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