Excess molar enthalpies H-m(E) for the binary mixtures containing dimethylcarbonate or diethyl-carbonate + cyclohexanone, 2-methylcyclohexanone and 2,6-dimethylcyclohexanone have been determined at 298.15 and 313.15K and at atmospheric pressure, utilizing an isothermal flow microcalorimeter. The experimental values have been correlated by the Redlich-Kister equation and the parameters have been evaluated by least-squares analysis. For all the mixtures, the H-m(E) values are positive with a maximum ranging from + 190 up to 700 J mol(-1). All curves present a regular trend decreasing with an increase in temperature. The experimental data have been examined by an extended cell model.