Isothermal vapor-liquid equilibria (VLE) have been determined for the dimethyl carbonate + diethyl carbonate mixture at five temperatures in the range (313.15 to 353.15) K in an equilibrium still with circulation of both the vapor and liquid phases. The data have been correlated by means of the Wilson equation. The system shows small positive deviations from ideality with liquid-phase activity coefficients not exceeding 1.26.