Abstract: A sliding window assembly is flush mountable within a window opening in the body of a vehicle and includes a frame nested and sealed within the body. A fixed or stationary window is mounted and sealed within one end of the frame. Opposed top and bottom inwardly curved first and second channel tracks are formed within the frame. A slidable window is mounted and sealed within the frame and aligned with the stationary window. Opposed longitudinally spaced first and second guide pins on the top and bottom of the slidable window extend into the first and second tracks respectively. On retraction of the slidable window, it is positioned upon the interior portion of the vehicle parallel to and spaced inwardly of the stationary window.