An integral door guide assembly is removably coupled in an opening of a door of a refrigerator and has an adjustable height. The refrigerator includes a first door rotatably connected to a front surface of a main body, and having an opening in which a plurality of door guide assemblies can be arranged, and a second door rotatably connected to a front surface of the first door. The door guide assembly includes a door guide, a guide removably fixed on both side walls of the opening, a moving unit removably coupled with both side walls of the door guide, guided by the guide to move in an up-down direction, a stopper coupled with the guide, and caught by or released from the catching projections to adjust a position of the moving unit and a latch configured to fix the stopper released from the catching projections.