The invention relates to a motor vehicle door with a side window, wherein a window winder being associated with the side window, by means of which the side window is able to be lowered in the door body. The side window is of split configuration, wherein a separate window winder is associated with each window part, by means of which the respective window part may be completely lowered in the door body. In the closed state the window parts are held in contact with one another by the force of a spring.