Six fire engines and around 40 firefighters attended a fire at a hospital on Frognal Avenue in Sidcup.
Rubbish was alight on the lower ground floor of a waste incinerator building on the hospital site. There were no reports of any injuries.
The Brigade was called at 1545 and the fire was extinguished by 1757. Crews from Orpington, Bromley, Lee Green and Bexley fire stations attended the scene.
The cause of the fire has been recorded as accidental.