Provided is a water tank for a refrigerator. The water tank includes a body part, a supply hole, and a supply part. The body part provides a space in which water for making ice is stored. The supply hole is opened to the outside of the body part. The water is introduced through the supply hole. The supply part is insertable and withdrawable into/from the body part. The supply part selectively opens the supply hole and guides the supplied water such that the water is introduced inside the body part through the supply hole. Thus, the water can be supplied by withdrawing the supply part to improve a user's convenience.