A brooch (also known as broach or in ancient times, a fibula) is a decorative jewelry item designed to be attached to garments. It is usually made of metal, often silver or gold but sometimes bronze or some other material. Brooches are frequently decorated with enamel or with gemstones and may be solely for ornament (as in the stomacher) or sometimes serve a practical function as a fastening, perhaps for a cloak.

The earliest known brooches are from the Bronze Age. As fashions in brooches changed rather fast, they are important chronological indicators.

The fibula or fibulae (plural) is an ornamental clasp used by Romans, Greeks and also by Celts and migratory tribes in Europe from the Early Bronze Age. They may have replaced fibulae made of more perishable Neolithic materials, such as bone to as late as 800 AD. Fibulae are useful type-objects: carefully catalogued local typologies, dating and distribution of fibulae can help date finds where neither numismatic nor ceramic materials provide a secure date. Fibulae were shaped somewhat like a large safety pin and were used to hold clothing together. They came in many varieties and held prominent significance for the identity of the wearer, indicating ethnicity (until local costume became Romanized) and class. Elaborately designed fibulae were an important part of Late Antique dress, and simpler ones were part of Roman military equipment.