Windscreen with adjustable height for a motorcycle, for associating with a front part of the motorcycle vehicle, including a support portion secured on this front part, a transparent portion movable relative to the support portion, and movement apparatus allowing varying height of this transparent portion relative to the support portion. The movement apparatus includes a body guidably movable inside a seat of the support portion and integral with the transparent portion. The movable body including lateral movable coupling elements for cooperating with consecutive and adjacent seats present at different heights on sides of the support portion seat. The coupling elements controlled by a release unit and subjected to thrust action of resilient elements which can thrust these coupling elements inside the seats of the elements in the support portion, to lock the transparent portion at different heights relative to the support portion.