The Au–Ga system was critically assessed by means of CALPHAD technique. Based on the experimental data in the literature, the excess Gibbs energies of the solution phases (liquid, fcc, orthorhombic) were modeled with the Redlich–Kister equation. The intermetallic compounds αAu 7 Ga, βAu 7 Ga 2 , β′Au 7 Ga 2 , γAu 7 Ga 3 and γ′Au 7 Ga 3 , which have homogeneity ranges, were treated as the formula Au 7 (Au,Ga), (Au,Ga) 7 Ga 2 , (Au,Ga) 7 (Au,Ga) 2 , (Au,Ga) 7 (Au,Ga) 3 and (Au,Ga) 7 (Au,Ga) 3 , respectively, using a two-sublattice model with Au and Ga or Au on the first sublattice, Au and Ga or Ga on the second one. The two compounds AuGa and AuGa 2 were treated as stochiometric compounds. A set of self-consistent thermodynamic parameters of the Au–Ga system was obtained.