A surfboard locking system includes a device for providing a securement point allowing a surfboard to be secured to a lock. The device includes at least a first piece and a second piece, each piece sized and shaped to be insertable into a fin box opening of a surfboard fin box. The first and second pieces are pieces couplable together within the fin box to form a securement, the securement sized and shaped such that the securement cannot be removed through the fin box opening. One of the pieces can include a passageway sized and shaped to accommodate a portion of a lock, such as the shackle of a padlock, to allow the surfboard to be securely locked to a cable or other object.