Excess molar enthalpies, H-m(E), of binary mixtures containing phenetole (ethoxy benzene) + alpha -pinene, or beta -pinene have been determined in the range (288.15-313.15) K, and at atmospheric pressure using a flow microcalorimeter. H-m(E) curves are symmetrical with positive values over the entire concentration range and show higher values for the mixture containing alpha -pinene (the maximum value for H-m(E) is 1072 J mol(-1)). Only a slight influence of temperature on excess molar enthalpies has been observed for both systems. Experimental results have been correlated using the Redlich-Kister polynomial and the adjustable parameters have been evaluated by least-squares analysis. Results have also been interpreted by an extended modified cell model of Prigogine.