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A ferrule (a corruption of Latin viriola "small bracelet," under the influence of ferrum "iron.") is a name for types of metal objects.

Most consist of a circular clamp used to hold together and attach fibers, wires or posts.

Examples of such ferrules:

• In a brush the ferrule binds the bristles or hair to the handle.
• On an ice axe, the metal spike at the end of the shaft.
• The metal ring which is crimped to hold the eraser in place on pencils with an attached eraser.
• The metal ring which holds a chisel blade's tang to the handle.
• The metal cap put on the end of a bicycle's cable housing.
• In fiber optic terminations, glass or plastic fibers are bonded to precision ferrules and polished for splitting or connecting two fibers together.
• In restorative dentistry: margin of a cast crown that stabilizes root-canal treated teeth
• In golf:plastic sleeve that adorns the bottom of most steel and graphite shafts just above the club head hosel. Originally designed to protect the shaft from damaging vibrations, it is now used mainly for aesthetic purposes.
• In musical instruments: a metal band used to prevent the ends of wooden instruments from splitting.
• Compression fittings for attaching tubing (piping) commonly have ferrules in them.
• A swaged termination type for wire rope
• Cap at the end of a cane.
• In pool and billiards, the portion of a cue that tops the shaft and to which the leather tip is bonded to. Historically they were made of ivory, however, they are now typically made of phenolic resin.

• Not to be confused with a ferula, the Latin name of a plant, and of a punishment device used to hit a pupil on the palm of the hand or on the knuckles.

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