The magnetocaloric effect and refrigeration capacity (RC) of ${\text{Gd}}_{55}{\text{Co}}_{20}{\text{Al}}_{25}$ and ${\text{Gd}}_{55}{\text{Ni}}_{25}{\text{Al}}_{20}$ bulk metallic glasses (BMGs) have been investigated. Large magnetic entropy changes $\Delta S_M$ of 11.2 and $10.8\text{J}{\text{kg}}^{-1}{\text{K}}^{-1}$ and large RC values of 846 and $920\text{J}{\text{kg}}^{-1}$ are obtained for ${\text{Gd}}_{55}{\text{Co}}_{20}{\text{Al}}_{25}$ and ${\text{Gd}}_{55}{\text{Ni}}_{25}{\text{Al}}_{20}$ , respectively, at a field change of 7 T. The RC value ($640\text{J}{\text{kg}}^{-1}$ at 5 T or $920\text{J}{\text{kg}}^{-1}$ at 7 T) of ${\text{Gd}}_{55}{\text{Ni}}_{25}{\text{Al}}_{20}$ BMG is larger than that reported for all magnetocaloric materials, including crystalline and amorphous materials measured under the same conditions. The large RC value is due to the broad $\Delta S_M$ peak (more than 100 K), which is caused by the disordered structure of an amorphous material. The large $\Delta S_M$ and RC values make these Gd-based ternary BMGs attractive candidates for magnetic refrigeration applications.