Markus Black, 20, was sentenced for an aggravated burglary and common assault in January but has breached the terms of his licence on his release from prison.
Black is described as white, 6’4 in tall with wavy blonde hair and of muscular build.
Metropolitan Police said Black is believed to have a firearm in his possession and is considered to be dangerous.
Black was last known to live in Brixton but he also has links in Croydon and Greenwich.
Anyone with any information is asked to call Brixton CID on 101 but it is important that you di not approach him.
If you have information but wish to remain anonymous contact Crimestoppers on 0800 555 111 or via crimestoppers-uk.org