Four fire engines and around 25 firefighters tackled a fire at a flat on Hampden Square in Southgate.
The fire occurred in a mixed-use three-storey building. Part of the first floor of a two-storey flat was damaged by fire. Two people left the building before the arrival of the Brigade and they were taken to hospital by London Ambulance Service crews suffering from smoke inhalation.
The Brigade's 999 Control Officers received 11 calls about the fire.
The Brigade was called at 0654 and the fire was under control by 0743. Firefighters from Southgate, Barnet, Tottenham and Finchley Fire Stations attended the scene.
The cause of the fire is under investigation.