Abstract: A height adjustable shelf for a refrigerator is provided. The refrigerator includes a shelf with a pair of guide protrusions formed on opposite side surfaces thereof, and a plurality of guide grooves formed in opposite side surfaces of a refrigerator storage space, at a same interval as the guide protrusions such that the guide protrusions move along the guide grooves. Each of the guide grooves includes an upper end portion, a lower end portion, and a connection portion that connects the upper and lower end portions. Movement of the guide protrusions between the upper end portions and the lower end portions allows a height of the shelf to be adjusted.