Six fire engines and around 40 firefighters were called to reports of a wood pile alight behind a nursery on Conduit Lane in Croydon.
Part of a large amount of piled wood was damaged by fire. There were no reports of any injuries.
The Brigade was called at 2124 and the fire was under control by 0144 (Tuesday). Fire crews from Croydon, Woodside, Addington and Norbury fire stations attended the scene.
The cause of the fire is under investigation.