Abstract: A reversible license plate holder attachable to a prepared rear panel of a vehicle. A rectangular perimeter frame has an obverse and a reverse side and an open central area, the frame having an L-shaped cross-section defining a flange sized to be aligned with and receive a license plate positionable thereagainst. The frame also has spaced mounting holes which are alignable with mounting holes in the license plate and with threaded holes in the rear panel for attaching the holder against the rear panel. When the holder is attached to the rear panel so that the reverse side faces outwardly in a temporary use mode by a car dealer, an upper retaining tab forming a first U-shaped channel with the frame trappingly receives an upper edge of the license plate and a lower retaining tab forming a second U-shaped channel trappingly receives a lower edge of the license plate when a lower edge of the flange is resiliently flexed downwardly, then released.