Disclosed is a refrigerator having an improved rear structure of a door. The refrigerator includes a main body including a storage compartment, a door rotatably coupled to the main body to open and close the storage compartment, a dispenser provided on a front surface of the door, a case mounted on a rear surface of the door and accommodating a water tank disposed adjacent to the dispenser to store water supplied to the dispenser, and a filter including a filter body disposed below the water tank in a transverse direction, and a filter handle configured to allow the filter body to be inserted or withdrawn through an inner side surface of the door from the inside of the case.