The London Fire Brigade (LFB) is the fire and rescue service for London, the capital of the United Kingdom. It was formed by the Metropolitan Fire Brigade Act 1865, under the leadership of superintendent Eyre Massey Shaw. It has 5,992 staff, including 5,096 operational firefighters and officers based at 102 fire stations (plus one river station).

The LFB is led by the Commissioner for Fire and Emergency Planning, a position currently held by Andy Roe. The brigade and Commissioner are overseen by the Greater London Authority, which in 2018 took over these responsibilities from the London Fire and Emergency Planning Authority (LFEPA).

In the 2015-16 financial year the LFB received 171,488 emergency calls. These consisted of: 20,773 fires, 48,696 false alarms of fire and 30,066 other calls for service. As well as firefighting, the LFB also responds to road traffic collisions, floods, shut-in-lift releases, and other incidents such as those involving hazardous materials or major transport accidents. It also conducts emergency planning and performs fire safety inspections and education. It does not provide an ambulance service as this function is performed by the London Ambulance Service as an independent NHS trust, although all LFB firefighters are trained in first aid and all of its fire engines carry first aid equipment. Since 2016, the LFB has provided first aid for some life-threatening medical emergencies (e.g. cardiac arrest or respiratory arrest).