A fire sprinkler system is an active fire protection measure, consisting of a water supply system, providing adequate pressure and flow-rate to a water distribution piping system, onto which fire sprinklers are connected.

Although historically only used in factories and large commercial buildings, systems for homes and small buildings are now available at a cost-effective price.

Fire sprinkler systems are extensively used worldwide, with over 50 million sprinkler heads fitted each year. In buildings completely protected by fire sprinkler systems, over 99% of fires were controlled by fire sprinklers alone.