A hook-and-eye closure is a very simple and secure method of fastening garments together. It consists of a metal hook, commonly made of flattened wire bent to the required shape, and an eye (or "eyelet") of the same material into which the hook fits.

The hook and eye closure has a long history and is still used today, primarily on brassieres.

This form of fastening first appears under the name of "crochet and loop" in 14th century England.

The first reference to the modern term appears in Aubrey's Brief Lives in 1697, which describes a doublet and breeches being attached with "hook and eies". Hooks and eyes were made by hand from wire, until the city of Redditch, England, already famous for needle manufacture, was the first to machine-manufacture them. In 1643 a woman in the American colony of Maryland is recorded to have paid £10 worth of tobacco for hooks and eyes.

The hook and eye played an important role in women's corsetry; used in rows, they distribute the stress involved in restrictive garments.