A wind deflector (5) for a motor vehicle with roof or a convertible top which can be transferred to a stowage space. The wind deflector (5) is pivotally supported on a cross beam (4) which extends over the front windshield (3), and it can be pivoted by a drive (13) which also actuates a detachable interlock of the convertible top (2) on the cross beam (4), depending on the position of the raising mechanism (18) which is actuated by the drive means (13) for the wind deflector (5), a locking device (11) is coupled to the drive (13) or is uncoupled from it.