The standard enthalpies of formation of PdGa and Pd2Ga have been determined by high-temperature direct synthesis calorimetry at (1473 +/- 2) K. The following values of Delta(f)H(0) in kJ (mol of atoms)(-1) are reported : PdGa (-71.6 +/- 2.3); Pd2Ga (-64.4 +/- 2.0). The results are compared with reported calorimetric data and with predicted values from the semi-empirical model of Miedema et al.