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An optimised set of thermodynamic functions for the Mg-Zn binary system has been obtained by the least squares method. The phases were modelled by the Redlich-Kister formula (liquid and hcp solid solutions), and as stoichiometric phases (Mg7Zn3, MgZn, Mg2Zn3, MgZn2, and Mg2Zn11). A temperature dependent enthalpy of mixing was considered during the calculations and partial enthalpies of the melt were measured calorimetrically The results confirm a positive excess specific heat. The diagrams calculated from the resulting coefficient set agree very well with the experimental data.