A retractable outside door handle assembly for a vehicle is provided. The assembly includes an outside door handle that protrudes outward in a width direction of a vehicle or is receivable into an opening formed at a door outer panel. A front link has a first end portion connected to be rotatable with a front portion of the outside door handle along the length direction of the vehicle. A connecting link connected to be rotatable with a second end portion of the front link at a first end portion thereof and installed to be movable along the length direction of the vehicle. A rear link includes a first end portion connected to be rotatable with a second end portion of the connecting link and a second end portion is connected to be rotatable with the outside door handle.