Children's ride-on vehicles having window mechanisms, and window mechanisms for such vehicles. In some embodiments, the window mechanism is a manual window mechanism, and in some embodiments the window mechanism is a powered, or motorized, window mechanism. The window mechanism includes a window drive assembly that selectively drives movement of a window member relative to the vehicle body. In some embodiments, the window drive assembly is a powered window drive assembly that includes a window motor assembly and a window linkage to couple the output of the window motor assembly to the window member. In some embodiments, the window drive assembly is a manual window drive assembly. In some embodiments, the window member includes a receiving region coupled to the window linkage. In some embodiments, the window mechanism includes a window support assembly that maintains the window member in a predetermined orientation relative to the vehicle body.