The bean weevils or seed beetles are a subfamily (Bruchinae) of weevils, which in turn are a subset of beetles. The Bruchinae now placed in the family Chrysomelidae, though they have historically been treated as a separate family. The subfamily includes about 1,650 species and are found worldwide.

Bean weevils are generally compact and oval in shape, with small heads somewhat bent under. Sizes range from 1–22 millimetres (0.039–0.866 in) for some tropical species. Colors are usually black or brown, often with mottled patterns. Although their mandibles may be elongated, they do not have the long snouts characteristic of other weevils. A defining characteristic of this subfamily is that the elytra don't quite reach the tip of their abdomens (as seen in the header image).

The Bruchinae are granivores, and typically infest various kinds of seeds or beans (hence their common names), living most of their lives inside a single seed; Host plants tend to be legumes, but species will also be found in Convolvulaceae, Arecaceae, and Malvaceae. The adults deposit eggs on seeds of these plants, then the larvae chew their way into the seed. When ready to pupate, the larvae typically cut an exit hole, then return to their feeding chamber. Due to this, several species are considered pests. The adult weevils have a habit of feigning death and dropping from a plant when disturbed.

Several species are native to Great Britain, but there are also records of several introduced species from stored products in warehouses and dwellings, although these species cannot proliferate outside of heated buildings in that climate.

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