Excess molar enthalpies, H-m(E), of binary mixtures containing (S)-(-)-limonene + alpha -pinene, + beta -pinene, or + p-cymene were determined using a flow microcalorimeter in the range 288.15-313.15 K, and at atmospheric pressure. The H-m(E) are always positive, not exceeding 114 J mol(-1), and curves show a symmetrical trend. The temperature dependence of the calorimetric data is slight. Results were correlated to the Redlich-Kister polynomial and the adjustable parameters were determined by the least-squares method. Results were also interpreted by an extended modified cell model of Prigogine.