Brig Gen Abdul-Ilah al-Bashir replaces Gen Salim Idris, who was criticised by many in the opposition for being ineffective and lost the confidence of the US and its allies particularly after Islamic extremists seized a weapons depot from moderate rebels.
The move was announced today in a statement by the FSA's Supreme Military Council.
Al-Bashir, who previously headed the group's operations in the province of Quneitra on the border with the Israeli-occupied Golan Heights, is considered a moderate Islamist.
His appointment, which was made by consensus among the FSA's 30-member military council late yesterday, is seen as part of attempts to revamp and restructure the Free Syrian Army after a series of embarrassing setbacks and to try to convince the West to provide more powerful weaponry.
It also seeks to show rival rebels that the group is re-energising with a new, credible leadership.
The FSA, a loose coalition of mainstream rebel groups, has seen its influence sharply wane and has suffered a series of setbacks in the past year, including an embarrassing raid on its weapons warehouse by Islamic extremists last year, which led to a temporary suspension of US non-lethal aid to the rebels.
