Pipunculidae is a family of flies (Diptera) commonly termed big-headed flies, a reference to the large (holoptic) eyes, which cover nearly the entire head. The family is found worldwide and more than 1300 species have been described.

The larvae of Pipunculidae develop as parasitoids almost exclusively in Auchenorrhyncha, the exception being the genus Nephrocerus, whose hosts are adult Tipulidae (crane flies). The larvae develop rapidly within the crane flies before pupating in the soil. In all pipunculids there are only two larval stages. Some species are used as biological control agents in rice fields.

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