A retractable outside door handle assembly for a vehicle according to an exemplary embodiment of the present invention may include an outside door handle protruded outward in a width direction of a vehicle rather than a door outer panel configuring a door of the vehicle or being receivable to an opening formed at the door outer panel. A first link has one end connected to one end of the outside door handle and the other end extending downward along a height direction of the vehicle. A second link has one end connected to one side and the other side of the outside door handle and the other end extending along the height direction of the vehicle. A main arm has one end rotatably connected to the door outer panel and the other end connected to the second link.