Firefighters were called to a road traffic collision in Sevenoaks Road in Orpington.
The collision involved two single decker buses and one car.
Assistant Commissioner Graham Ellis said: “Firefighters rescued several casualties from the buses and immediately undertook first aid, being joined by colleagues from London Ambulance Service.
"Firefighters also made the vehicles and surrounding area safe."
Sadly one person was pronounced dead at the scene. A number of people were injured and were taken to hospital by London Ambulance Service crews.
The Brigade was called at 2212 (Oct 31). Six fire engines, two fire rescue units and around 60 firefighters attended the scene.