A door knocker is an item of door furniture that allows people outside a house or other dwelling or building to alert those inside to their presence. A door knocker has a part fixed to the door, and a part (usually metal) which is attached to the door by a hinge, and may be lifted and used to strike a plate fitted to the door, or the door itself, making a noise. The struck plate, if present, would be supplied and fitted with the knocker. Door knockers are often ornate, but may be no more than a simple fitting with a metal bob, or ring.

The sound of a door knocker

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German professor Franz Sales Meyer distinguished three kinds of door knocker: the "ring", the "hammer", and an ornate category which could take the shape of an animal or another figure.^[1] High demand for antique door knockers in the early 20th century in the United States caused forged versions to emerge.^[2]

• A British cast iron door knocker
• "Ring of Mercy" on the Dom (Cathedral) St. Maria. of Augsburg.
• Dragonhead door knockers, Bulguksa Temple, Gyeongju, South Korea
• Hamsa door knocker in Morocco
• Angel door knocker in Harderwijk, the Netherlands
• Door knocker in Venice
• Door knocker in Orléans, France
• Door knocker in Haji Bulagi House, Iran
• Door knocker in Behnam House, Iran
• A door in Fez, Morocco with two knockers. Traditionally, one was used by women and the other by men (see top left).
• Door knocker depicting an Eagle warrior in Querétaro, Mexico.
• Hand-shaped door knocker in Spain
• Lion head door knocker at the Raczyńskich Library
• Renaissance door knocker in Toulouse, France

• Doorbell