The integral enthalpy of mixing of liquid Al-Cu-La-Ni alloys for vertical sections with x A l :x C u :x N i =0.16:0.68:0.16 and x C u :x L a :x N i =0.13:0.74:0.13 was determined by solution calorimetry at 1173 and 1081 K, respectively. An adiabatic calorimeter was used to measure the heat capacity C p l of liquid Al 2 5 Cu 1 0 La 5 5 Ni 1 0 . The heat capacity of undercooled liquid, amorphous and crystalline Al 2 5 Cu 2 0 La 5 5 and Al 2 5 Cu 1 0 La 5 5 Ni 1 0 alloys was measured by differential scanning calorimetry (DSC). The association model was applied to calculate the thermodynamic properties of liquid and undercooled liquid Al-Cu-La-Ni alloys using the model parameters of the six limiting binary and four limiting ternary alloys. The measured C p l (T) of liquid Al 2 5 Cu 1 0 La 5 5 Ni 1 0 at the liquidus temperature is larger than that of the undercooled liquid state above the glass transition temperature. The calculated C p l (T) curve exhibits a maximum for undercooled liquid Al 2 5 Cu 1 0 La 5 5 Ni 1 0 .