Arson is the crime of intentionally and maliciously setting fire to buildings, wildland areas, cars or other property with the intent to cause damage. It may be distinguished from other causes such as spontaneous combustion and natural wildfires. Arson often involves fires deliberately set to the property of another or to one's own property as to collect insurance compensation.

A person who commits this crime is called an arsonist. Many arsonists use accelerants, such as petrol or paraffin to get a fire going.