The specific heat of Zr-based Zr 60 Al 15 Cu 15 Ni 7.5 Co 2.5 and Zr 65 Al 7.5 Cu 27.5 metallic glasses was measured in the temperature range from 77 to 800K using an ac calorimeter. Several exothermic and endothermic processes were observed indicating the transformation sequences required to completely crystallize both glasses. A decrease in the specific heat is ascribed to structural relaxation. The specific heat increases monotonically through the glass transition temperature (T g ), peaks and then decreases abruptly with increasing temperature. The amplitude and maximum temperature (T p ) of the peak increase with an increase of heating rate. The T p increases from 729K at 2Kmin −1 to 774K at 40Kmin −1 .