Provided is a refrigerator. The refrigerator includes a main body having a refrigerating compartment and a freezing compartment, a door that opens or closes the refrigerating compartment or the freezing compartment, a dispenser disposed in the door to dispense cold water; a filter unit disposed within the refrigerating compartment to purify water supplied from a water supply source outside the main body, a water tank storing the water supplied from the filter unit to cool the stored water by using cool air within the refrigerating compartment, and a tube tank assembly disposed in the door to store the cold water cooled in the water tank. The tube tank assembly includes a tube defining a cold water passage through which the cold water flows and a tube support around which the tube is wound several times.