Four fire engines and around 25 firefighters were called to a flat fire on South Audley Street, Mayfair.
A small part of a fourth floor flat was damaged by fire. There were no reports of any injuries.
The Brigade was called at 1241 and the fire was under control at 1333. Fire crews from Soho, Euston, Chelsea, and Paddington fire stations attended the scene.
The cause of the fire is under investigation.