Gonyleptidae is a neotropical family of harvestmen (order Opiliones) with more than 800 species, the largest in the suborder Laniatores and the second largest of the Opiliones as a whole. The largest known harvestmen are gonyleptids.

Like most harvestmen, gonyleptids are almost exclusively nocturnal, except some Caelopyginae, Goniosomatinae (during reproductive season), Gonyleptinae, Mitobatinae, Pachylinae and Progonyleptoidellinae. Most species inhabit dense tropical, subtropical and temperate (Chile) forests, but some occur in open vegetation as the Pampas, the Cerrado, and the Caatinga. There are some species that live in caves, but only three troglobites are recorded for the family.

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