A soldering iron is a tool used for applying heat to two or more adjoining metal parts or wires so that solder will melt and flow between those parts, binding them securely and providing an unbroken flow of electricity.

A soldering iron consists of a heated metal tip, a short metal shaft, and an insulated handle. Most soldering irons use a mains electricity supply to achieve the high heat temperatures required. Although some soldering irons use a gas to generate the heat supply, which can either be delivered through a tank mounted on the iron (flameless), or through an external flame.

Some soldering irons heat up and cool down in a few seconds, however most take several minutes and a soldering iron station is a useful device for safely storing the soldering iron during warm-up, cool-down and between working.

See also soldering gun