The integral molar enthalpies of mixing are described by drop calorimetry for liquid alloys based on the (Al + Li) and (Al + Li + Zn) system, with the use of the Setaram MHTC 96 Line Evo calorimeter. The measurements for the (Al + Li) system were carried out at two temperatures, 1023 K and 1027 K, and compared with the literature data. The integral molar enthalpies of mixing of the liquid binary system over the entire concentration range have negative values. Moreover, for the mole fraction of lithium (X-Li = 0.5053), the minimum value of the integral enthalpy of mixing of the (Al + Li) system is equal to Delta H-mix(m) = -12.1 kJ . mol(-1). The experimental studies for the (Al + Li + Zn) system involved measurements at three different temperatures: 942 K for the (Al0.90Li0.10)(1 x)Zn-x alloy composition; 978 K for the (Al0.35Li0.65)(1 x)Zn-x and (Al0.65Li0.35)(1 x)Zn-x alloy composition and finally, 1014 K for the (Al0.50Li0.50)(1 x)Zn-x alloy composition. This work presents a complete study of mixing enthalpies in (Al + Li) and (Al + Li + Zn) systems and may therefore provide reference for earlier attempts on calorimetric measurements of the (Al + Li + Zn) system. (C) 2015 Elsevier Ltd. All rights reserved.