The Piperaceae (), also known as the pepper family, are a large family of flowering plants. The group contains roughly 3,600 currently accepted species in five genera. The vast majority of species can be found within the two main genera: Piper (2,171 species) and Peperomia (over 1,000 species).

Members of the Piperaceae may be small trees, shrubs, or herbs. The distribution of this group is best described as pantropical.

The best-known species, Piper nigrum, yields most peppercorns that are used as spices, including black pepper, although its relatives in the family include many other spices. The family Piperaceae is unrelated to the family Solanaceae, which includes bell peppers and chili peppers, which are so named due to Europeans taking part in the Columbian exchange mistakenly believing the spicy fruits were a variety of the black pepper plant.

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